cylindrical solid whose radius and height are equal has a surface area of 154cm2. Calculate its diameter, correct to 2 decimal places. (Take = 3.142)

Answer 1

SA=2(PI*r^2)+PI*r*h
solve for r (r and h are equal)
SA=r^2(2PI+PI)
r=Sqrt (SA/3Pi) and thendiameter is 2*radius.