A wall 10m long,20cm thick and 1.2m high has been constructed as a partition between two plots of land. Find the cost of cementing it on five sides at the rate of rupees 25 per square metre.
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In the given Cuboidal Wall ;
l = 10m
b = 1.2 m
h = 20 cm = 0.2 m
Area to be cemented
= Total surface area - area of bottom side
= 2(lb+bh+hl) - hl
= 2(10×1.2 + 1.2×0.2 + 0.2×10) - (0.2×10)
= 2(12+0.24+2) - 2
= 2(14.24) - 2
= 26.48 m sq.
Cost of painting
= Area×Rate
= 26.48 × 25
= 662 Rs
______________
l = 10m
b = 1.2 m
h = 20 cm = 0.2 m
Area to be cemented
= Total surface area - area of bottom side
= 2(lb+bh+hl) - hl
= 2(10×1.2 + 1.2×0.2 + 0.2×10) - (0.2×10)
= 2(12+0.24+2) - 2
= 2(14.24) - 2
= 26.48 m sq.
Cost of painting
= Area×Rate
= 26.48 × 25
= 662 Rs
______________
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