Use double angle identity

We can relate '6x' to '3x' in the same way since 6 is 2*3.

Now sub into left side of identity. Simplify until it equals right side.
Answer:
x=10.9
Step-by-step explanation:
tan 36⁰=x/15
cross multiply
15 tan36⁰=x
x= 15 x 0.7265
x= 10.9
The triangle BAC has two known measurements 30 and 90 so add those together and subtract by 180
30 + 90 = 120
180 - 120 = 60°
It’s always turning away from the sun