Question

Question #bcfa0

Answer 1

The diameter of the base is `D = 25 cm` hence the radius is `R = 12.5 cm`
The radius of the circle base is r = R – thickness = `12.5 – 1 = 11.5 cm`
The height is `h = 20 cm`
The whole Surface Area of the pipe #= 2 πR h + 2π r h + 2 π( R^2 - r^2 ) = 2*3.14 * 12.5 * 20 + 2 * 3.14 * 11.5 * 20 + 2 * 3.14 ( 12.5^2 - 11.5^2 ) = 1570 + 1444.44 + 6.28 ( 156.25 – 132.25 ) = 3014.4 + 148.8 = 3163.2 cm^2 #