Question

Find the value of the trigonometric ratio. And the degree of the angle. Show work!

Answer 1

40/41

Explanation:

Using cosine rule,

Cos C = 40/41

`\frac{40 {}^(2) + 41 {}^(2) - 9 {}^(2) }{2 * 40 * 41} = (3200)/(3280) = (40)/(41)`

And if you need the angle too,

Just do,

C = cos¯¹ 40/41 = 12.68038 = 12.7