Is the side of a square be increased by 50% find the percent increase in area?
Hint: We will use the area of the rectangle to solve this question. The area of the rectangle is given by A = lb, where l is the length of the rectangle and b is the breadth of the rectangle.
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Note: The possibility of error in this question is using old length and breadth given by x and y to determine the new area and the new percentage change in area. Always go for using new length l’ and new breadth b’ to determine the new area A’. Note: In this type of question students may make mistakes in calculation of the new side, they have to remember to add the old side along with a percent increase to obtain the new side. Also, as the required result is in the form of percentage so that students have to calculate $\%$ increase in the area. When each edge of a cube is increased by 50% by what percent is the surface area of the cube increased?∴ Percentage increase in surface area =125 %.
Is the side of a square is increased by 25% then its area is increased by?x+x+x×x100=2x+x2100=25+25+25×25100=56.25%
What is the percent increase in area of a square if its side is increased by 10%?Hence, the area of the square gets increased by 21% if its side is increased by 10%.
What will be the increase in area if the side of a square is increased by 30?∴ The area is increased by 69%.
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