Question

A swimming pool measures 25 m long and 10 m wide. It has a shallow end that is 1 m deep and gradually slopes down to a depth of 4 m at the deep end. The inside walls of the pool need repainting. Calculate the total area of the surfaces to be painted, to the nearest square metre

Answer 1

the long sides are trapezoids with area (1+4)/2 * 25
The ends are rectangles, with areas 1*10 and 4*10
the bottom is a rectangle with area 10*√(3^2 + 25^2)