Interior Angles in a Triangle (Solve for x)

What is the measure of the missing angle?

• 60 degrees

• 85 degrees

• 90 degrees

• 70 degrees

Tags

CCSS.8.G.A.5

What is the value of x?

• x = -9

• x = 11

• x = -13

• x = 55

Answer explanation

x + 44 + 55 + 90 = 180

Solve for x

Tags

CCSS.7.G.B.5

Solve for x:

• x = -6

• x = -12

• x = 100

• x = 2

Answer explanation

x + 61 + x + 51 + 80 = 180

2x + 192 = 180

2x = -12

x = -6

Tags

CCSS.8.G.A.5

What is the measure of angle A?

• 22 degrees

• 33 degrees

• 4 degrees

• 17 degrees

Answer explanation

5x + 2+ 6x + 134 = 180

11x + 136 = 180

11x = 44

x = 4

plug this in to find A

A = 5x + 2 = 5(4) + 2=

22

Tags

CCSS.8.G.A.5

What is the measure of angle A?

• 60 degrees

• 70 degrees

• 50 degrees

• 90 degrees

Answer explanation

11x - 5 + 9x - 3 + 48 = 180

20x + 40 = 180

20x = 140

x = 7

plug this in to find A

A = 9x - 3 = 9(7) - 3 = 60

Tags

CCSS.8.G.A.5

The sum of the angles in a triangle sum to ________.

• 360 degrees

Tags

CCSS.8.G.A.5