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Q.
If each edge of a cube is increased by 50%, find the percentage increase in Its surface area
A.
1.25
B.
1.5
C.
1.75
D.
1.1
View Answer
Correct choice: A
Explanation:
Let the edge = a cm So increase by 50 % = a + a/2 = 3a/2 Total surface Area of original cube = 6a2 TSA of new cube = 6(3a/2)2 =6(9a2/4)= 13.5a2 Increase in area = 13.5a2−6a2 =7.5a2 7.5a2 Increase % =7.5a2/6a2 ×100 = 125%
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