CTET 2 Math and Science Nov 2012 Paper

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Question : 51 of 120

Marks: +1, -0

If the circumfercnce of a circle is 3 cm, then its area, in

cm^{2}

, is

${3π} / 2$
$9/ {4π}$
$4 / {9π }$
${9π } / 4$

Solution:

Circumference of circle = 3 cm

2πr=3cm

(∴r = radius)

r=3/{2π}

cm
Area of circle

=πr^2

⇒π×\;\;{3}/{2π}×\;\;{3}/{2π}

⇒\;\;{9}/{4π}{cm}^{2}

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