What is the area of triangle ABC? Round to the nearest tenth of a square unit. Triangle A B C is shown. The length of side A C is 10 and the length of C B is 13. Angle B A C is 64 degrees and angle A C B is 72 degrees. Trigonometric area formula: Area = 54.9 square units 58.8 square units 61.8 square units 64.1 square units