This math topic involves using the Rule of Cosines to solve triangles, specifically focusing on the setup of the formula. It includes multiple problems where students are asked to select the correct formula to calculate a side length of a triangle given some sides and an included angle. Each problem offers multiple answer choices in the form of expressions involving the triangle's mathematical properties. This topic is part of a larger unit on solving triangles in trigonometry.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.