Question

Find the length of side BC give your answer to three significant figures

Answer 1

19.4 cm

Explanation:

Hi there!

This is a right triangle. We're given an angle, the side adjacent to the angle and we're solving for the hypotenuse. Given this information, we can use the cosine ratio:

`cos\theta=(adj)/(hyp)`

Plug in the given angle and side

`cos71=(6.3)/(BC)\\BC=(6.3)/(cos71) \\BC=19.4`

Therefore, the length of BC is 19.4 cm when rounded to 3 significant figures.

I hope this helps!