Isosceles & Equilateral Triangles

If two sides of a triangle are congruent, then the _________________ opposite those sides are congruent.

• sides
• vertices
• angles
• measures

Tags

CCSS.HSG.CO.C.10

What do the angles in an equilateral triangle measure?

• 30°, 60°, 90°

• 60°, 60°, 60°

• 45°, 45°, 90°

• 35°, 55°, 90°

Tags

CCSS.8.G.A.5

Find the value of x

• 41
• 45
• 31
• 98

Tags

CCSS.8.G.A.5

If an isosceles triangle has a base angle measuring 40°, then what measure is the vertex angle?

• 120°
• 100°
• 40°
• 80°

Tags

CCSS.8.G.A.5

Find x

• 10
• 32
• 116
• 16

Tags

CCSS.8.G.A.5

What is the measure of ∠A?

• 46°

• 134°

• 90°

• 88°

Tags

CCSS.8.G.A.5

What is the equation you would use to find x?

• 3x = x

• 3x + x = 180

• 3x + 3x + x = 180

• 3x + x + x = 180

Tags

CCSS.8.G.A.5

What is the equation you would use to find y?

• 7y = 4y - 15

• 7y + 4y - 15 = 180

• 7y + 4y - 15 + 4y - 15 = 180

• 7y + 7y + 4y - 15 = 180

Tags

CCSS.8.G.A.5

What is the equation you would use to find x?

• 4x + 1 = 5x - 4

• 4x + 1 + 5x - 4 = 180

• 4x + 1 + 4x + 1 + 5x - 4 = 180

• 4x + 1 + 5x - 4 + 5x - 4 = 180

Tags

CCSS.8.G.A.5

What is the value of x?

• not enough information

• 30

• 60

• 180

Tags

CCSS.HSG.CO.C.9