a room is 10 M long 6M wide and 4.2 M height it has one door of 2.5 m into 1.5 m and one window of dimensions 1.5 m into 1 m find the cost of whitewashing the walls at Rs 2.50 per square metre
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Total area for whitewashing =Curve surface Ares of room -(area of door - area of window)
curved surface area of room= 2(l+b)h
2(10+6)4.2
2(16)4.2
134.4 m²
area of door =2.5×1.5
3.75m²
Area of window =1.5 ×1
1.5m²
area for whitewashing =134.4 -(3.75+1.5)
129.15m²
cost for whitewashing=129.15 ×2.5
rs 323
curved surface area of room= 2(l+b)h
2(10+6)4.2
2(16)4.2
134.4 m²
area of door =2.5×1.5
3.75m²
Area of window =1.5 ×1
1.5m²
area for whitewashing =134.4 -(3.75+1.5)
129.15m²
cost for whitewashing=129.15 ×2.5
rs 323
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