What is the radius, in inches, of a right circular cylinder if its lateral surface area is 3.5 square inches and its volume is 3.5 cubic inches?
Volume of cylinder = pi r^2 h
Lateral surface area = pi d * h
pi r^2 h = 3.5
pi d * h = 3.5
pi 2 r h = 3.5
Two equations , two unknowns solve for r
pi r^2 h = 3.5 = pi 2r h
r^2 = 2r divide both sides by 'r'
r = 2 inches