Question : The area of a circle is 1386 cm2. What is the radius of the circle?
[Use $\pi= \frac{22}{7}$]
Option 1: 7 cm
Option 2: 14 cm
Option 3: 18 cm
Option 4: 21 cm
Answer (1)
23rd Jan, 2024
Correct Answer: 21 cm
Solution :
The area of a circle is $\pi r^2$, where $r$ is the radius of the circle.
Given that the area = 1386 cm
2
$⇒1386 = \frac{22}{7} r^2$
$⇒r^2=441$
$⇒r = 21$
Hence, the correct answer is 21 cm.
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