A tree is growing at an angle out of the ground, 15°17' from vertical. Standing 10 feet away from the base, the angle to the top of the tree is 25°17'. What is the length of the tree?

Answer 1

assuming you are on the low side of the tree
angle from tree to ground = 90 - 15d17m
= 74d43m

final angle up top = 180 - 74d43m- 25d17m
= 80 d

law of sines
sin80/10 = sin25d17m/L