Triangle Interior Sum

Select ALL that are true.

• The third angle in the triangle measures 69 degrees.

• x = 69

• x = 111

• x equals 75 plus 36

Tags

CCSS.8.G.A.5

• 33

• 53

• 90

• 213

Tags

CCSS.8.G.A.5

The three angles of a triangle measure x, 2x, and 6x. What is the value of x?

• 9

• 20

• 40

• 90

Tags

CCSS.8.G.A.5

Which can be used to find the sum of the measures of the interior angles of any polygon?

• n x 180, where n is the number of sides

• (n-2) x 180 where n is the number of sides

• The sum is always 180.

• The sum is always 360.

What is the sum of the angles inside a triangle?

• 90

• 180

• 360

Tags

CCSS.8.G.A.5

What is the sum of the interior angles of a triangle?

• 360

• 180

• 270

• 90

Tags

CCSS.8.G.A.5

Which set of angle measures could be the interior angles of a triangle?

• 25°, 30°, 35°

• 35°, 60°, 75°

• 45°, 60°, 75°

• 60°, 90°, 120°

Tags

CCSS.8.G.A.5

Tags

Exterior Angle Theorem

Using the theorem for the sum of the interior angles of a triangle, find the third angle for each triangle.

Tags

CCSS.8.G.A.5

Solve for x.

• -12

• -8

• -10

• -5

Tags

CCSS.8.G.A.5