Page 45 - NUMINO_WB_5B
P. 45
120-P1-1

Exterior Angles of Triangles and Quadrilaterals

Find the measures of the unknown angles.
a

120
80 b 110

Step 1. Find the measure of angle b.

Step 2. Find the sum of the interior angles of the quadrilateral.
Step 3. Find the measure of angle a.
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