Include a drawing that fails a defining condition. Three connected line segments do not make a triangle if they form an open path rather than a closed three-sided shape.
An original two-dimensional set
Original schematic materials, not copied worksheet artwork or measured pupil responses:
| Drawing ID | Description | In the closed-triangle selection? |
|---|---|---|
| T1 | Closed scalene triangle with three straight sides | Yes |
| T2 | A smaller, rotated version of T1, scaled uniformly | Yes |
| S1 | Square: four equal sides and four right angles | No |
| S2 | The same square rotated 45 degrees | No |
| O1 | Three consecutive sides of a square; fourth side absent and endpoints do not meet | No |
The prompt is “Select every closed three-sided shape.” T1 and T2 qualify. O1 has three segments but lacks closure. S1 and S2 have four sides and belong to the separate square comparison.
The geometry reference asks learners to name shapes across orientations and sizes and compare attributes. Use your actual curriculum and class context to decide where this original exercise fits; the reference is not a claim that every school requires this worksheet.
Make the before/after comparison preserve geometry
For T2, rotate and uniformly shrink T1 rather than replacing it with an unrelated triangle. Uniform scaling preserves the defining three-sided closed shape; stretching one axis is unnecessary for the task.
For S2, rotate S1 around its center. Keep all four sides equal and all four angles right. Feedback can say “Its orientation changed; its square attributes did not.” Do not mark it incorrect solely because a point now faces upward.
An open path deserves its own explanation: trace the three segments and locate the two endpoints that do not meet. In this example, simply drawing an additional closing segment would create a four-sided shape, so closure alone would not make that revised drawing a triangle. Count the resulting sides as well.
Ask for the evidence after the choice
After a learner selects a drawing, reveal the side, corner, and closure evidence in both words and visual labels. Do not use color, size, or orientation as the reason a triangle qualifies.
For the separate square item, ask whether rotating S1 changes its classification and why. Keep the same drawing identity through the rotation. If you later add rectangle categories, state whether you use the inclusive definition in which squares are rectangles; do not force two competing exclusive labels without declaring that rule.
Give a full text alternative for each shape and a keyboard route for selection and rotation. Reset clears choices, explanations, and transformation state. Leave actual learner explanations blank until the activity is used.
Copy an attribute-based worksheet brief
Create one complete, self-contained US-English HTML companion for “Shape studio • look for the attributes”. Return the full HTML document, with inline CSS and any JavaScript needed for the local interactions. Use the original scenario, named records, numbers and expected cases below.
Design the page for this task: use clearly labeled input or source records, a readable result or worked example, and an adjacent explanation of the evidence. Use a restrained visual hierarchy, left-aligned text, readable tables or stacked records, and a responsive layout at 720px and 360px. Provide meaningful labeled controls for T1 Select; T2 Select; S1 Select; S2 Select; O1 Select; Check my choices; Start again; Turn 45°; Still a square; Different shape. Use keyboard-accessible native controls and visible focus. Keep the complete content readable without an external dependency.
The following brief supplies the substantive content and constraints. Native-format requests describe the material to represent or copy manually; this HTML must not pretend to create DOCX, XLSX, PDF, PPTX, H5P or another native file, run Python/Flask/Django/Snowflake/Power BI, connect a live service, send messages, or perform an authorized real-world action. Where the task requires a native source, actual observation or separate approval, retain that requirement and leave unsupplied evidence blank.
Prepare original shapes practice in US English.
Learner context: [enter or TO CONFIRM]
Shape definitions and classification convention: [paste teacher-reviewed rules]
Original drawings with IDs, coordinates or exact attribute descriptions: [paste]
Allowed rotation/uniform-size changes: [enter]
Create a closed-three-sided selection item and a separate rotated-square
comparison. Verify closure, side counts and relevant angles. Preserve shape
identity under rotation and uniform scaling. Feedback names defining evidence,
not color/size/orientation. Describe open paths explicitly; do not assume adding
a closing edge always yields a triangle. Keep rectangle inclusion rules explicit
if used. Do not invent learner outcomes or reuse source artwork.
Return drawings' text descriptions, prompts, key and feedback. If requested,
provide HTML local selection/rotation/reset with keyboard alternatives and
real coordinate transformations. Reset clears answers/explanations/transforms. No saved score, student data collection, or learning diagnosis.
COMPLETE AUTHORED SCENARIO AND EXPECTED CASES
The following is the supplied reading/teaching/calculation record to represent in the companion. Preserve its particular content, examples, source references and unknowns. Wording about a future native implementation refers to that native task, not permission to omit this HTML companion.
# Shapes Interactive Worksheets: Keep the Shape When Its Orientation Changes
A rotated square can look like a diamond, but turning it does not remove its equal sides or right angles. Ask learners to identify shapes from their defining attributes, then use rotation and size changes to check the explanation.
Include a drawing that fails a defining condition. Three connected line segments do not make a triangle if they form an open path rather than a closed three-sided shape.
## An original two-dimensional set
**Original schematic materials, not copied worksheet artwork or measured pupil responses:**
| Drawing ID | Description | In the closed-triangle selection? |
| --- | --- | --- |
| T1 | Closed scalene triangle with three straight sides | Yes |
| T2 | A smaller, rotated version of T1, scaled uniformly | Yes |
| S1 | Square: four equal sides and four right angles | No |
| S2 | The same square rotated 45 degrees | No |
| O1 | Three consecutive sides of a square; fourth side absent and endpoints do not meet | No |
The prompt is **“Select every closed three-sided shape.”** T1 and T2 qualify. O1 has three segments but lacks closure. S1 and S2 have four sides and belong to the separate square comparison.
The [geometry reference](https://www.thecorestandards.org/Math/Content/K/G/) asks learners to name shapes across orientations and sizes and compare attributes. Use your actual curriculum and class context to decide where this original exercise fits; the reference is not a claim that every school requires this worksheet.
## Make the before/after comparison preserve geometry
For T2, rotate and uniformly shrink T1 rather than replacing it with an unrelated triangle. Uniform scaling preserves the defining three-sided closed shape; stretching one axis is unnecessary for the task.
For S2, rotate S1 around its center. Keep all four sides equal and all four angles right. Feedback can say **“Its orientation changed; its square attributes did not.”** Do not mark it incorrect solely because a point now faces upward.
An open path deserves its own explanation: trace the three segments and locate the two endpoints that do not meet. In this example, simply drawing an additional closing segment would create a four-sided shape, so closure alone would not make that revised drawing a triangle. Count the resulting sides as well.
## Ask for the evidence after the choice
After a learner selects a drawing, reveal the side, corner, and closure evidence in both words and visual labels. Do not use color, size, or orientation as the reason a triangle qualifies.
For the separate square item, ask whether rotating S1 changes its classification and why. Keep the same drawing identity through the rotation. If you later add rectangle categories, state whether you use the inclusive definition in which squares are rectangles; do not force two competing exclusive labels without declaring that rule.
Give a full text alternative for each shape and a keyboard route for selection and rotation. Reset clears choices, explanations, and transformation state. Leave actual learner explanations blank until the activity is used.
## Copy an attribute-based worksheet brief
Implement the local companion rather than returning a text-only plan. Preserve every numerical fixture and the distinction between illustrative expectations and actual evidence. Any native-runtime or classroom tests mentioned above remain tests to perform in the proper environment; do not mark them passed. Keep edits and practice responses in this open page only, without claiming persistent storage. Provide invalid/missing-input feedback and reset behavior that agree with this specific brief. Do not claim accessibility certification, learning gains, real approvals or test results that were not observed.
Check T1/T2 and S1/S2 with a teacher before giving learners the worksheet. Keep the final question on what stayed the same: three closed sides for the triangles, and four equal sides with four right angles for the squares.