Question : The area of a circle is 1386 cm2. What is the radius of the circle? [Use $\pi=\frac{22}{7}$ ]
Option 1: 21 cm
Option 2: 7 cm
Option 3: 14 cm
Option 4: 18 cm
Answer (1)
24th Jan, 2024
Correct Answer: 21 cm
Solution :
Given: The area of a circle = 1386 cm
2
Also, the area of a circle = $\pi r^2$, where $r$ is the radius of the circle.
⇒ $1386=\frac{22}{7}\times r^2$
⇒ $r^2 = 63\times7 $
⇒ $r=21$
Hence, the correct answer is 21 cm.
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