A circular iron plate of radius 24 cm is heated, and its radius increases by 1.8%. What is the approximate percentage increase in its area?
Show answer & explanation
Correct answer: C
Explanation
Has been given :
Increase in radius = 1.8%
According to the formula:
If radius increases by x% then increase in area = 2x + x²/100
x = 1.8
Increase in area = 2 × 1.8 + (1.8)² / 100 × 100 = 3.64%