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Step-by-step explanation:
Leveling of ground is done in whole triangular area
We need to find area of triangular ground
Sides of ground a = 40m , b = 70m , c = 90m
Area = √( s*(s-a)*(s-b)*(s-c) ) where a , b and c are sides
s= (a + b + c)/2 = ( 40 + 70 + 90) /2 = 100
Area = √( 100 * (100-40) * (100-70) * (100-90) )
= √( 100 * 60 * 30 * 10) = 600√5 = 1341.64 m^2
Cost of leveling =Rs.4 per m^2
Total cost = 4 *1341.64 = Rs. 5366.56
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