Triangles and Equations Value of X

The angle measures of a triangle are shown in the diagram below. What is the value of x?

• x = 17

• x = 5

The measures of two angles in an isosceles triangle are shown in the diagram. Which equation can be used to find the value of x?

• 45 + 2x = 180

• 2(45) + x = 180

The angle measures of a triangle are shown in the diagram below. What is the value of x?

• x = 20

• x = 35

What is the measure of ∢x?

• 37

• 47

What is the measure of ∢x?

• 22

• 10

What is the value of x?

• x = 9

• x = 12

Find the m∢a.

• 90°

• 61°

The measures of the angles in a triangle are shown in the diagram. Which equation can be used to find the value of x?

• 2x + x = 180

• 3(2x) = 180

Two angles of a triangle measure 62^o and 41^o. What is the measure of the third angle?

• 103^o, because the sum of 62 and 41 is 103.

• 77^o, because the difference of 180 and the sum of 62 and 41 is 77.

In the triangle picture, if m∡1 = 34^o and the m ∡ 3 = 38^o, what is m∡ 2?

• 108°

• 72°