Isosceles and Equilateral Triangles

Isosceles and Equilateral Triangles

Isosceles Triangle

• If a triangle has two congruent sides, then it will have two congruent angles.

• If a triangle has two congruent angles, then it will have two congruent sides.

Open Ended

If the legs are congruent then the base angles are ________________.

Open Ended

If AB = 5cm, then BC = ?

If m<A = 50 degrees, then m<C = ? 

Open Ended

Find the m<T.

Open Ended

Find the m<P.

Multiple Choice

What is the value of x?

• 90

• 21

• 45

• 35

Multiple Choice

What is the m<A?

• 46

• 90

• 88

• 134

Equilateral Triangle

• If a triangle has 3 congruent sides, then it will have 3 congruent angles.

• If a triangle has 3 congruent angles, then it will have 3 congruent sides.

Open Ended

Each angle in an equilateral triangle measures _______.

Open Ended

What is the value of x?

Open Ended

What is the value of x?

Multiple Choice

What is the measure of BC?

• 12

• 6

• 10

• Not enough information

Multiple Choice

What is the value of x?

• 16

• 60

• 8

• Not enough information

Multiple Choice

What is the value of x?

• 4

• 2

• 3

• 10