C is the centre of a circle of radius 20 cm. AB is a chord of length 32 cm. E is a point on AB such that CE = 13 cm. What is AE × EB equal to?

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UPSC CDS-I 2025 (Elementary Mathematics) Official Paper (Held On: 13 Apr, 2025)
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  1. 231 square cm
  2. 256 square cm
  3. 272 square cm
  4. 297 square cm

Answer (Detailed Solution Below)

Option 1 : 231 square cm
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Detailed Solution

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Given:

C is the center of a circle with radius = 20 cm.

AB is a chord of length = 32 cm.

CE = 13 cm, E is a point on AB.

We need to find AE × EB.

Formula used:

In a circle, for any chord AB and point E on AB:

AE × EB = (Radius2 - Distance from center to chord2)

Calculation:

Radius = 20 cm, so Radius2 = 202 = 400

Distance from center to chord (CE) = 13 cm, so CE2 = 132 = 169

⇒ AE × EB = Radius2 - CE2

⇒ AE × EB = 400 - 169

⇒ AE × EB = 231

∴ The correct answer is option (1).

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