Triangles
A triangle is a polygon with three sides. By its sides it is equilateral (all three equal), isosceles (two equal) or scalene (none equal); by its angles it can be right-angled, have one obtuse angle, or have all acute angles. Three sides fit together in only one way, so a triangle can't wobble - that is why frames and bridges are built from triangles. Its three angles always add up to 180°.
Depth 1 · Foundation
You can sort triangles by their sides (equilateral, isosceles, scalene) and by their angles, read the marks that show equal sides, and explain why a triangle frame is stiff.
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- 1
Foundation
You can sort triangles by their sides (equilateral, isosceles, scalene) and by their angles, read the marks that show equal sides, and explain why a triangle frame is stiff.
- 2
Deeper
You know the angles of every triangle add up to 180°, can show it by tearing off the corners, find a missing angle, and explain why a triangle has at most one right angle.
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