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4-16.

Use your Trig Table from problem 4-15 to help you find the value of each variable below.

Review the Math Notes box in this lesson (4.1.2) as a reference to find slope angles that produce slope triangles with special ratios.

1. By the Triangle Angle Sum Theorem, $79° + θ + 90° = 180°$

$θ = 11 ^{\large \circ }$

$x ≈ 18.46$

1. Notice that the legs of the right triangle are the same lengths.

1. Look at the hints in part (a).