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Level 105

Isosceles & Equilateral Triangles

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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
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]