Polygon (Triangle)

TRIANGLE: A figure (polygon) with three sides. KINDS: 1. EQUILATERAL TRIANGLE: A triangle all of whose sides are congruent.

2. ISOSCELES TRIANGLE: A triangle with at least two sides  congruent.

3. RIGHT TRIANGLE: A triangle with one right angle.

4. SCALENE TRIANGLE: A triangle with no congruent sides.

• LEGS (of a right triangle): The two sides in a right triangle that  are also sides of the right angles.

Illustration:

 • HYPOTENUSE: The side opposite the right angle in a right  triangle.

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