Compose Shapes Studio
Pick small shapes and combine them to build bigger ones. Two triangles make a square, two squares make a rectangle, and two semicircles make a circle.
Choose your level:
Build this shape
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Large Square
Can you make a square using exactly 2 triangles?
You need 2 pieces
Score: 0
Two right triangles fit together to make a square.
Pick a shape to add:
Your pieces:
No pieces added yet. Tap a shape above to start.
Reference Guide
Composing Shapes
- Composing means putting smaller shapes together to make a new shape.
- Two triangles can form a square or a rectangle.
- Two semicircles form a circle.
- Noticing how shapes fit together builds spatial thinking.
Why Shapes Fit Together
- Shapes can be rearranged without changing their area.
- A right triangle has one corner that is exactly 90 degrees.
- Two right triangles with the same size fit perfectly to make a rectangle.
- This is how puzzle pieces and tiles cover flat surfaces.
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Related Labs
Shape Sorter & Compose Shapes Lab
Classify 2D shapes by attributes and combine small shapes to build larger ones. Investigate how sides and corners relate, and how simple shapes compose into complex ones. Grades K-1.
Shape Classifier Lab
Explore 12 geometric shapes from triangles to circles. Inspect sides, angles, parallel pairs, and lines of symmetry for each shape, then record your findings to discover the properties that define each shape family.
Symmetry & Pattern Blocks Lab
Investigate lines of symmetry in 10 shapes. Toggle vertical, horizontal, and diagonal fold lines to discover which shapes have the most symmetry, then record your findings and look for patterns across regular and irregular shapes.
Shape Detective & Angle Hunt Lab
Hunt for angles in 8 different shapes. Classify each angle as acute, right, obtuse, or straight, then identify what type of triangle or quadrilateral each shape is.
