AB = 28 cm and CD = 22 cm are two parallel chords on the same side of the centre of a circle. The distance between them is 4 cm. The radius of the circle is ________. (Consider up to two decimals) 

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SSC CGL 2023 Tier-I Official Paper (Held On: 21 Jul 2023 Shift 2)
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  1. 15.20 cm
  2. 14.82 cm
  3. 15.82 cm
  4. 13.20 cm

Answer (Detailed Solution Below)

Option 3 : 15.82 cm
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Detailed Solution

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Given:

F1 Savita SSC 29-8-24 D1

AB = 28 cm and CD = 22 cm are two parallel chords on the same side of the centre of a circle.

The distance between them is 4 cm.

Calculation:

Let the OE is x, EF = 4 cm

As per the question,

OA = OC = radius of the circle

⇒ 142 + x2 = (x+4)2 + 112

⇒ 196 + x2 = x2 + 16 + 8x + 121

⇒ 8x = 59

x = 59 / 8 

The radius will be,

√(142 + (\({59\over8}\))2 = 15.82 cm

∴ The correct option is 3

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