Isosceles Triangle Theorem

What is the measure of each base angle in an isosceles triangle?

• Equal

• 90 degrees

• 45 degrees

• 180 degrees

In an isosceles triangle, if one angle is 70 degrees, what is the measure of each base angle?

• 60

• 55

• 70

• 80

If the measure of each base angle in an isosceles triangle is 45 degrees, what is the measure of the third angle?

• 45

• 60

• 180

• 90

True or False: In an isosceles triangle, the base angles are always congruent.

• False

• Sometimes

• True

• Depends on the triangle

What is the name of the theorem that states the base angles of an isosceles triangle are congruent?

• Equilateral Triangle Theorem

• Right Triangle Theorem

• Isosceles Triangle Theorem

• Pythagorean Theorem

If the measure of one base angle in an isosceles triangle is 60 degrees, what is the measure of the other base angle?

• 60

• 90

• 45

• 30

In an isosceles triangle, if one base angle is 80 degrees, what is the measure of the other base angle?

• 100

• 80

• 60

• 90

What is the name of the theorem that states the sides opposite the congruent angles in an isosceles triangle are congruent?

• Isosceles Triangle Theorem

• Pythagorean Theorem

• Triangle Inequality Theorem

• Angle Bisector Theorem

True or False: In an isosceles triangle, the congruent sides are always the base sides.

• True

• False

• Sometimes

• Not necessarily

If the length of one congruent side in an isosceles triangle is 5 cm, what is the length of the other congruent side?

• 10

• 5

• 3

• 7