Shapes & Geometry

Learn about flat shapes (2D) and solid shapes (3D)!

1st Grade

Geometry

~30 min

🎮 Interactive Activity: Shape Explorer

Explore different shapes and learn their properties!

Circle

1. Flat Shapes (2D)

📐 2D Shapes are Flat!

2D shapes are flat like a piece of paper. They have length and width but no depth.

Circle

0 sides, 0 corners

Triangle

3 sides, 3 corners

Square

4 equal sides, 4 corners

Rectangle

4 sides, 4 corners

📝 Example: Counting Sides and Corners

Question: How many sides and corners does this shape have?

Solution:

Step 1: Count each straight edge → 5 sides

Step 2: Count each point where sides meet (red dots) → 5 corners

Answer: This is a Pentagon (5 sides, 5 corners)

Remember!

For most 2D shapes: Number of sides = Number of corners!

Triangle (3=3), Square (4=4), Pentagon (5=5), Hexagon (6=6)

2. Solid Shapes (3D)

3. Building with Shapes

4. Sorting and Classifying Shapes

5. Shapes in Real Life

Practice Time!

Practice Quiz

Questions

Correct

Score

How many sides does a triangle have?

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What shape has 4 equal sides and 4 corners?

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How many corners does a circle have?

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What shape is a door usually?

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How many sides does a rectangle have?

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What shape is a pizza slice?

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Which shape can roll?

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A ball is what kind of shape?

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How many corners does a square have?

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If you cut a square in half diagonally, what shapes do you get?

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