Find the Missing Measure for Triangles

What is the measure of angle A in the triangle?

• 116*

• 25*

• 62*

• 54*

• x = 54
• x = 9
• x = 24
• x = 144

Two angles of a triangle add up to 65°.  What is the measure of the third angle?

• 25°

• 55°

• 115°

• 295°

What is the measure of the missing angle?

• 140

• 130

• 50

• 90

Set up an equation to find x.

• 42 + 8x = 2 + 12x

• 2 + 12x + 42 = 8x

• 42 + 8x + 2 + 12x = 180

• 42 + 8x = 180

Set up an equation to find x.

• 52 + 5x + 16 + 10x + 8 = 180

• 52 - 5x + 16

• 52 + 5x + 16 = 10x + 8

• 52 + 10x + 8 = 5x +16

Find the missing side of the large triangle, then, find the PERIMETER of the large triangle.

• the missing side is 12, the perimeter is 24

• the missing side is 12, the perimeter is 36

The pair of figures is similar. Find the missing side.

• x = 20

• x = 12

• x = 5

• x = 4

The two right triangles below are similar. What is x, the missing side length in triangle DEF? 

• 3.75

• 9.75

• 10

• 12

The triangles are similar, solve for the question mark.

• 8

• 12.5

• 18

• 24