Fundamental Ideas
Triangles
Legs, base, vertex angle, and base angles. In an isosceles triangle, the two equal sides are called
legs, and the third side is called the
base. The angle formed by the two equal sides is called the
vertex angle. The other two angles are called
base angles (Figure
1 ).
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In a right triangle, the side opposite the right angle is called the
hypotenuse, and the other two sides are called
legs (Figure
2 ).
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