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Home > GC > Chapter 8 > Lesson 8.1.2 > Problem 8-17


The missing exterior angles each form a straight angle with an interior angle.
What is the measure of a straight angle?

You will need to find the angle that forms a linear pair with ∠d.
If a quadrilateral can be made into two triangles, what is the sum of the interior angles of a quadrilateral?

a = 87º, b = 83°, c = 96° d = 94º,
a + ∠b +∠c + ∠d = 360°