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In this lesson you will learn how to find the measurement of an exterior angle by using your knowledge of supplementary angles.

Let’s Review Supplementary angles ° 60°

Let’s Review Adjacent angles 1 2

A Common Mistake x°x° y°y° B A C D

Let’s Review Core Lesson AC B Exterior Interior

Let’s Review Core Lesson Find the value of x. 57°x°x° B A C D

Let’s Review Core Lesson x = x = 180 x = 107 x + y = 180 y = 73 x°x° y°y° 27° 52° C A BD

Let’s Review Core Lesson x = 180 and x + y = 180 x° y°y° 27° 52° C A BD

Let’s Review Core Lesson (2x – 15) + (x – 5) = 148 3x – 20 = 148 3x = 168 x = ° (2x – 15)° (x – 5)°

In this lesson you have learned how to find the measure of an exterior angle by using your knowledge of supplementary angles. Summary:

Let’s Review Quick Quiz Find the value of x 112° 32° x°x° Question #1

Let’s Review Quick Quiz Find the value of x and the measurement of each interior angle. (100)° (2x + 27)° (2x – 11)° BA C Question #2

Let’s Review Quick Quiz Find the value of x and each interior angle. (x + 16)° (5x)° (3x – 7)° BA C Question #3