CPM Homework Help : CCA2 Problem C-58

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C-58.

Find the value of $x$ in each triangle.

Hint (a):
Use the Law of Cosines.
More Help (a):
$C²\ =\ A² + B² - 2AB\text{cos}(c)$
$(x)²\ =\ (15)² + (21)² - 2(15)(21)\text{cos}(40°)$
Answer (a):
$x\ =\ \sqrt{666-630\text{cos}(40°)}$
$x ≈ 13.542$

Hint (b):
Find the last angle, then use the Law of Sines.
Answer (b):
$x ≈ 68.770$

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