Question : A hall of 10 m in length, 5 m in width, and 6 m in height is to be painted (one side only). Determine the total surface area to be painted. (neglect the area of windows and doors)(floor area is NOT to be painted)
Option 1: 300 m2
Option 2: 280 m2
Option 3: 330 m2
Option 4: 230 m2
Correct Answer: 230 m 2
Solution :
Given: Length = 10 m
Width = 5 m
Height = 6 m
Area of 4 walls = 2(l + w)h
= 2 × (10 + 5) × 6
= 2 × 15 × 6
= 180 m
2
Area of ceiling = l × w
= 10 × 5
= 50 m
2
Total area = 180 + 50 = 230 m
2
Hence, the correct answer is 230 m
2
.
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