Question

Can someone please help me with this

Answer 1

angle at a straight line is =180

4+5+x=180

let x be angle at the tower

9+x=180

x=180-9

x=171°

and x is divide in to two then is 2x

there for

2x=171°

x=171/2

x=85.5°

then sin85.5°= 90/y

let y be the unknown feet

0.9969=90/y

y0.9969=90

y=90/0.9969

y=90.3ft.