Exploring Isosceles and Equilateral Triangles

What are the two congruent sides of an isosceles triangle called?

• Vertex angles

• Base angles

• Hypotenuse

• Legs

In an isosceles triangle, what is the angle called where the legs meet?

• Base angle

• Supplementary angle

• Vertex angle

• Right angle

Tags

CCSS.HSG.CO.C.11

According to the isosceles triangle theorem, if two sides of a triangle are congruent, what can be said about the base angles?

• They are right angles

• They are complementary

• They are supplementary

• They are congruent

If angle A is congruent to angle C in an isosceles triangle, what can be said about sides AB and CB?

• AB is perpendicular to CB

• AB is longer than CB

• AB is shorter than CB

• AB is congruent to CB

Tags

CCSS.HSG.CO.C.9

If one base angle of an isosceles triangle is 68 degrees, what is the measure of the other base angle?

• 90 degrees

• 68 degrees

• 44 degrees

• 112 degrees

Tags

CCSS.8.G.A.5

In an isosceles triangle, if the vertex angle is 44 degrees, what is the measure of each base angle?

• 68 degrees

• 90 degrees

• 44 degrees

• 112 degrees

Tags

CCSS.8.G.A.5

What is the measure of each angle in an equilateral triangle?

• 90 degrees

• 120 degrees

• 60 degrees

• 45 degrees

Tags

CCSS.8.G.A.5

If all sides of a triangle are equal, what type of triangle is it?

• Equilateral

• Isosceles

• Right

• Scalene

Tags

CCSS.4.G.A.2

In an equilateral triangle, if one side is 9 cm, what are the lengths of the other sides?

• 12 cm and 12 cm

• 9 cm and 12 cm

• 6 cm and 6 cm

• 9 cm and 9 cm

Tags

CCSS.2.G.A.1

If all sides of a triangle are 24 cm, what is the measure of each angle?

• 90 degrees

• 60 degrees

• 45 degrees

• 120 degrees

Tags

CCSS.8.G.A.5