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A small pateform is made in a cricket ground.it has 15 stairs.length of each stairs is 50m and it is made of solid cconcrete. height and breadth of each

stairs is 1/4m and 1/2m respectively. find the total volume in construction of a plateform.


height of 1st step =1/4 m.
 height of second step=1/4+1/4 =2 × 1/4
height of 3rd step = 3 × 1/4 and so on.

V1= (50×1/2×1/4),V2=)50×1/2×(2×1/4)) ,and so on
total volume of concrete = V1+V2+.........+V15
= (50×1/2×1/4)+(50×1/2×(2×1/4))+.............+(50×1/2×(15×1/4)) m³
=25/4×15/2(1+15)            ∴ use Sn = n/2(a+l)  
=750 m³

2 4 2
pls mark it as the best answer..........
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