Question: A set of steps for the end of a pier are built of stone. A sketch of the cross-section of the steps is shown.
Each step has rise of 0.2m and tread of 0.6m. Form a series to calculate the area of the cross-section.
I tried to answer the question but I got it wrong
I tried to to find the area of A
using Sums of arithmetic - i found the length of the stairs
area of a =
area b = 8 x 12 = 96
therefore total area = 214.8 square metres
the answer in the book is 118.8 square metres
Can someone please help