A small terrace at a football ground comprises of 15 steps each of which is 50 m long and built of solid concrete. Each step has a rise of `1/4`m and a tread of `1/2`m. Calculate the total volume of concrete required to build the terrace.

Explanation

Volumeof 1st step=`1/4*1/2*50=50/8`

Volume of 2nd step=`2/4*1/2*50=100/8`

Volume of 3rd step=`3/4*1/2*50=150/8`

Volume are in AP

`S_n=n/2(2a+(n-1)d)`

`S_15=15/2(2(50/8)+(15-1)50)`

`S_15=750m^3`