The surface area of a cylinder is the sum of the areas of the two circles on each end and the area encircling "rectangle". Note that the length of this "rectangle" is the height of the can, while the width is the perimeter of the circle. The full equation is:
I think it must be the right triangle so x=height of the antenna tan(66)=x/50 x=50*tan(66) x=1.33 ft ->the height of the antenna = 1.33 ft hope it is the correct answer because you didn't provided me enough information.