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Isosceles Legs

The 2 congruent sides of an Isosceles triangle which has only 2 sides.

vertex angle

the angle in-between the two congruent sides (legs) of the triangle

Base

the number that is written with an exponent

Base angles

are equal.

legs of an isosceles triangle

The congruent sides of the isosceles triangle

base of isosceles triangle

the side opposite the vertex angle

Isosceles Triangle Theorem

If 2 sides of a triangle are congruent, then the angles opposite those sides are congruent

Converse of Isosceles triangle theorem

If two angles of a triangle are congruent, then the sides opposite those angles are congruent

equilateral triangle corollary 4-9-3

If a triangle is equilateral, then it is equiangular

equiangular triangle corollary 4-9-4

If a triangle is equiangular, then it is equilateral.

midpoint formula

(x₁+x₂)/2, (y₁+y₂)/2

Distance Formula

d = √[( x₂ - x₁)² + (y₂ - y₁)²]