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Chapter 3: Q. 3.67 (page 356)

The measures of two angles of a triangle are 31 and 128 degrees. Find the measure of the third angle.

Short Answer

Expert verified

The third angle is 21 degrees.

Step by step solution

01

Step 1. Given information

The two angles of a triangle are 31 and 128 degrees.

02

Step 2. Known information

The sum of all angles in a triangle is 180 degrees.

03

Step 3. Solution 

The unknown angle be x.

31+128+x=180159+x=180x=180-159x=21

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