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  1. The area of the circumcircle of an equilateral triangle is 3p sq. cm. The perimeter of the triangle is
    1. 33 cm
    2. 9 cm
    3. 18 cm
    4. 3 cm
Correct Option: B

Using Rule 18,

Circum-radius =
Side
√3

∴ Area of circum-circle = π ×
Side²
 = 3π
3

⇒ Side² = 9
⇒ Side = 3 cm
∴ Perimeter of triangle = 3 + 3 + 3 = 9 cm


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