Question : If the perimeter of the circle is 13.2 cm, then the radius of the circle is___________.
$\left(\right.$ Take $\left.\pi=\frac{22}{7}\right)$
Option 1: 6.6 cm
Option 2: 4.2 cm
Option 3: 2.1 cm
Option 4: 3.3 cm
Answer (1)
21st Jan, 2024
Correct Answer: 2.1 cm
Solution :
Let $r$ be the radius of a circle.
The perimeter of the circle = 13.2 cm
$2\pi r = 13.2$
$⇒2 × \frac{22}{7} × r = 13.2$
$\therefore r = \frac{13.2 × 7}{2 × 22}= 2.1$ cm
Hence, the correct answer is 2.1 cm.
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