Question

On a sunny afternoon, a 10-meter tall billboard casts a shadow that is 6 meters long. At the same time a nearby building casts a shadow that is 4 meters long.

Answer 1

1) 10/6 = H/ 4 or 5/3 = H/2 or H = 10/3 = 3.3 m 

2) sin P = 3/5 (given) = sin (90-Q) = cos Q = 3/5