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If the radius of a given circle is increased by 50%, then find the increase in the area of that circle ?

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125%

100%

75%

50%

answer is A.

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Detailed Solution

Concept: Assume the radius of the circle to be r and then after increasing the value. Similarly assume the area of the circle and then find the new area of the circle. Then find the % increase in the area.
Let the radius

units. Then Area,

Increased radius

units

Increased area

increase

Hence, the correct answer is option 1.

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