A shape’s boundary may consist of straight sides, curved sides, or a combination of both; straight sides are line segments, while curved sides bend continuously rather than forming a segment. This understanding supports describing and classifying familiar two-dimensional shapes, including distinguishing shapes by their boundary features rather than by orientation, size, or color; more formal properties of curves are not included.
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- Learn “Recognize straight and curved sides” with a detailed explanation of the concept
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- Download (or modify) a free worksheet on Recognize straight and curved sides you can use at home or in class with practice problems that scaffold and explore “Recognize straight and curved sides” from different perspectives.
- Start working on adaptive units like “Geometry Basics - Practice” or “Geometry - Shape Classification (2D) - Intro” that introduce, teach, or practice “Recognize straight and curved sides” to maximize your learning.
Detailed Explanation: Recognize straight and curved sides
Look at the boundary, or outside edge, of the shape. Move your finger around the edge and notice whether each part is straight or bends.
Example: A shape has a bottom side, two upright sides, and a rounded top.
- Trace the bottom edge. It does not bend, so it is a straight side.
- Trace the left edge. It does not bend, so it is another straight side.
- Trace the right edge. It does not bend, so it is another straight side.
- Trace the rounded top. It bends continuously, so it is a curved side.
So, the shape has:
- 3 straight sides
- 1 curved side
Remember: Count the parts of the outside boundary. A shape can have only straight sides, only curved sides, or both.
Learn by doing: Recognize straight and curved sides
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Practice:
Shape Composites - Composite Shape Name to Shape Set
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Download/Modify Free Grade 2 'Recognize straight and curved sides' Worksheet
Print this free 'Recognize straight and curved sides' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Shape Composites - Composite Shape Name to Shape Set
- 2D Shape Match - With Rotation, Different Color
- 2D Shapes - Side and Vertex Naming - Image to Yes/No
- 2D Shapes - Side and Vertex Naming - Image to Name
- 2D Shapes by Side Count
- Count Sides and Vertices on 2D Shapes - First Time
- Count Sides on 2D Shapes
- Classifying Polygons by Sides (Real World) - Reversed
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Recognize straight and curved sides) through scaffolded problems that grow in difficulty as concepts are understood.