Isosceles Triangles

Question 1

Definition of an Isosceles Triangle

Answer 1

A triangle with two congruent sides

Question 2

The two congruent sides of an Isosceles triangle are called…

Answer 2

legs

Question 3

The one non-congruent side of an isosceles triangle is called the…

Answer 3

base

Question 4

The two legs of an isosceles triangle form the…

Answer 4

vertex angle

Question 5

The two angles formed by the base and a leg are called the…

Answer 5

base angles

Question 6

Isosceles Triangle Theorem

Answer 6

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

if sides, then angles

Question 7

Converse of the Isosceles triangle theorem

Answer 7

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

If angles, then sides

Question 8

Theorem about bisecting (no name)

Answer 8

If a line bisects the vertex angle of an isosceles triangle, then that line is also the perpendicular bisector of the base.

Question 9

Converse of Theorem about bisecting (no name)

Answer 9

If a line is the perpendicular bisector of the base of an isosceles triangle, then that line also bisects the vertex angle.

Question 10

Corollary to Isosceles Triangle Theorem

Answer 10

If a triangle is equilateral, then it is equiangular

Question 11

Corollary to converse of the Isosceles triangle Theorem

Answer 11

If a triangle is equiangular, then it is equilateral

Question 12

Obtuse Isosceles Triangle

Answer 12

The vertex angle of the isosceles triangle is obtuse