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Triangles

Find the unknown angles in triangles

Triangle angle sum theorem
The sum of the degree measures of the angles of a triangle is 180º.

aº + bº + cº = 180º

What is the measure of the missing angle?

The sum of the three angles must be 180°. The two angles you know measure 90° and 53°.

Write an equation and find the measure of the unknown angle.

90° +
 53° + ?
= 180°

 143° + ?
= 180°

? =
 180° – 143°

? = 37°

The measure of the missing angle is 37°.

What is the measure of the missing angle?

º