Help pleaes

The triangles are similar. what is the value of x? x=

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.

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie