Question

Solve for a side in right triangles

Answer 1

7.45 units

Explanation:

`\cos 20\degree = (BC)/(AB)\\\\0.939692620 = (7)/(AB)\\\\AB = (7)/(0.939692620)\\AB = 7.4492\\AB = 7.45 units`

Answer 2

? = 7.45

Explanation:

Since this is a right triangle, we can use trig functions

cos theta = adjacent side/ hypotenuse

cos 20 = 7 / ?

Multiply each side by ?

? cos 20 = 7

Divide each side by cos 20

? = 7/ cos 20

? =7.449244407

To the nearest hundredth

? = 7.45