This question was previously asked in

UP Police SI (दरोगा) Previous Paper 7 (Held On: 19 Dec 2017 Shift 3)

Option 3 : 154 square cm

**Given:**

Area of square = 121 cm^{2}

**Formula used:**

Circumference of circle = 2πr

Area of circle = πr^{2}

Area of square = (a)^{2}

Perimeter of square = 4a

Where, a → side of square

**Calculation:**

Area of square = (a)2

⇒ 121 = (a)2

⇒ a = 11 cm

According to question

Circumference of circle = perimeter of square

⇒ 2πr = 4a

⇒ 2πr = 4 × 11

⇒ r = 44/(2π)

⇒ r = (22 × 7)/22

⇒ r = 7 cm

Area of circle = πr2

⇒ Area of circle = (22/7) × 7^{2}

⇒ Area of circle = 154 cm^{2}

**∴ Area of circle is 154 cm2**

RRC Group D Full Mock Test

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