Question

Brianna made a design with chalk on the playground in the shape of a triangle. Two sides of the triangle measuring 5 feet and 8 feet meet at a 40° angle. What is the area of the triangle? Round your answer to the nearest tenth.

Answer 1

Answer:

12.9 ft²

Step-by-step explanation:

sin = opp/hyp

sin 40 = height/ 5

5 * sin40 = height

h = 3.213938048432697

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area = (1/2)bh

a = (1/2) * 8 * 3.213938048432697

a = 12.9 ft²