At a time of day when the sun can be sighted at an angle of 60° above the horizon, a flagpole casts a shadow that is 21 ft long. How tall is the flagpole?
Tan(60) =The flagpole/ its shadow
1.732 =The flagpole / 21 cross multipy
The flagpole =1.732 x 21 =36.37 feet.
