Question

Use the diagram to answer the question

What is the measure of A

(Inverse trigonometry)

Answer 1

Explanation:

`sin A = (BC)/(AC) \\ \\ \therefore \: sin A = (13)/(15) \\ \\ \therefore \: sin A = 0.866 \\ \\ \therefore \: sin A = sin \: 60 \degree \\ \\ \therefore \: A = \: 60 \degree \\ \\`