Question

Pls help Im so confused

Answer 1

57 ft

Explanation:

Solution Given:

BC =40ft it also known as a.

<C=55°

<B=90°

<C=180-90-55=35°

height of the building =? also known as c

we have

law of sines

`(Sin A)/(a) =(Sin B)/(b)=(Sin C)/(c)`

By inserting value
`(Sin 35)/(40) =(Sin 55)/(c)`

you can take any two what you want
doing criss cross multiplication

Sin 35*c=Sin55*40

we get
c=sin55 * 40 /Sin35

c=AB=57.12 ft in nearest 10 it is 57 ft