Question 959560
You are correct, this is a right triangle 90, 20, 70
note that the tangent trig function is defined as opposite side divided by the adjacent side of the formed triangle
for this problem we know the adjacent side is 600 feet and the angle is 20 degrees, therefore
tan(20) = opposite side (height of building) / 600 and
opposite side (height of building) = tan(20)*600 = 218.38214056
the height of the building is approx 218.4 feet