a hall is 12m long. 10m wide and 5m high. its wall and the roof are to be patinted form inside .find the tatal area to be painted. also find its cost at rate of rur 5.40per sq. m
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Area to be painted= area of walls + area of roof
=Curved surface area+ top area
= 2h(l+b)+[l×b]
=2×5(12+10) + 12×10
=10×22 + 120
=340 m²
cost required for painting= 5.40/m²
cost required for painting 340 m²= 340×5.40
=₹1386
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