Equilateral Triangle
3 equal sides
3 equal angles
Isosceles Triangle
2 equal sides
2 equal angles
Scalene Triangle
0 equal sides
0 equal angles
Triangles are also defined by the type of angles they have inside.
Obtuse Triangle
Has an angle > 90°
Right Triangle
Has a 90° angle
Acute Triangle
All angles are < 90°
A TRIANGLE is a three sided polygon. The sum of the interior angles in any triangle is 180°.
Triangles are defined by the number of their sides/angles that are equal.
The triangles in a tangram are all RIGHT ISOSCELES
TRIANGLES: 2 equal sides, 2 equal angles, and have a 90°
angle. The angles of a right isosceles triangle are 90°,
45°, and 45° (total = 180°).