Athree-dimensional figure with two parrallel, congruent bases that are polygons

If eh = hg and hg=16, find the diameter of k

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.