You are trying to find the side between the right angle and the degree (This is known as the adjacent) You are given degree 42 You also given the longest side of 19 (This is known as the hypothenuse) Cosine: adjacent/hypothenuse Cos42 = x/19 0.7431448255 = x/19 x = 19 * 0.7431448255 x = 14.11975168, round to tenth
