Finding Missing Interior Angles in Triangles

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

• 180 degrees

• 90 degrees

• 270 degrees

• 360 degrees

How can the sum of interior angles be used to find a missing angle in a triangle?

• Add the known angles and subtract from 180

• Multiply the known angles by 180

• Subtract the known angles from 90

• Divide 180 by the number of known angles

If two angles in a triangle are 50 and 60 degrees, what is the third angle?

• 60 degrees

• 90 degrees

• 70 degrees

• 80 degrees

If a triangle has angles x, x+10, and x+20, what is the value of x?

• 60

• 40

• 70

• 50

What is the measure of an angle in a triangle if the other two angles are 65 and 45 degrees?

• 85 degrees

• 80 degrees

• 75 degrees

• 70 degrees

Given a triangle with angles 5x, 7x, and 3x, what is the value of x?

• 10

• 12

• 18

• 15

In a triangle with angles represented by 3x, 3x, and 90 degrees, what is x?

• 60

• 45

• 30

• 15

If the angles of a triangle are represented by 2x, 3x, and 4x, what is the value of x?

• 20

• 50

• 30

• 40

If one angle in a triangle is 90 degrees and the other two are 4x and 5x, what is the value of x?

• 20

• 10

• 25

• 15

After finding x = 12 in a triangle with angles 5x, 4x, and 4x, what is the measure of the largest angle?

• 72 degrees

• 60 degrees

• 84 degrees

• 48 degrees