Answer:


Step-by-step explanation:
Use the trigonometry formula

You are given that

Substitute into the first formula

Angle
is acute angle, then the sine of this angle is positive and

I think it’s A I hope it helps
Answer:
42
Step-by-step explanation:
The height of the pole is 4 times shorter than the length of the shadow 20÷5=4
The height of the building must be 4 times shorter than its shadow length 168÷4=42
Use two points to find the slope