If each edge of a cube is increased by 10%, then the percentage increase in its surface area is:
Answer & explanation
Correct answer: option 1
Concept=
If the edge of a cube is increased from x to y then the percentage increase in its area will be y2 - x2
So ,
+10% = \(\frac{11}{10}\)
Here x = 10 and y = 11
So, percentage increase in area = 112 - 102 = 21%