Exploring Isosceles and Equilateral Triangles

What is the name of the angle where the legs of an isosceles triangle intersect?

• Base angle

• Vertex angle

• Right angle

• Supplementary angle

Tags

CCSS.HSG.CO.C.11

If two sides of an isosceles triangle are congruent, what can be said about the angles opposite those sides?

• They are right angles

• They are congruent

• They are supplementary

• They are complementary

Tags

CCSS.8.G.B.8

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

• 44 degrees

• 68 degrees

• 106 degrees

• 112 degrees

Tags

CCSS.8.G.A.5

What is the sum of the angles in any triangle?

• 90 degrees

• 360 degrees

• 180 degrees

• 270 degrees

Tags

CCSS.8.G.A.5

If a triangle is equilateral, what can be said about its angles?

• They are all 45 degrees

• They are all 90 degrees

• They are all 120 degrees

• They are all 60 degrees

Tags

CCSS.4.G.A.2

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

• 6 feet

• 8 feet

• 9 feet

• 7 feet

Tags

CCSS.2.G.A.1

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

• Scalene

• Isosceles

• Equilateral

• Right

Tags

CCSS.4.G.A.2

In an isosceles triangle, if the vertex angle is 104 degrees, what is the measure of each base angle?

• 38 degrees

• 52 degrees

• 76 degrees

• 68 degrees

Tags

CCSS.8.G.A.5

If two angles of a triangle are 60 degrees each, what is the measure of the third angle?

• 90 degrees

• 45 degrees

• 30 degrees

• 60 degrees

Tags

CCSS.8.G.A.5

In an isosceles triangle, if one base angle is 29 degrees, what is the measure of the vertex angle?

• 180 degrees

• 29 degrees

• 122 degrees

• 58 degrees

Tags

CCSS.8.G.A.5