Q) AB is a chord of a circle centred at O such that ∠AOB=60˚. If OA = 14 cm then find the area of the minor segment. (take √3 =1.73)

Ans: 

Let the chord AB cut the circle in 2 parts. Sector APB is minor segment and AQB is major one.

Step 1: Now in △AOB, radius OA=OB=14 cm

Therefore, ∠OAB  = ∠OBA  [identity: angles opposite to equal side]

Given that ∠AOB=60°

Therefore, ∠AOB + ∠OAB + ∠OBA = 180°

or  60° + 2 ∠OAB = 180°

or 2 ∠OAB = 120°

∠OAB = 60° and ∠OBA = 60°

Since All angles are 60°, therefore △OAB is an equilateral triangle

Step 2: Now, area of minor segment APB = Area of sector OAPB – Area of △OAB

= πr²   − (OA)²                     

=  x 14 x 14 x   − x 14 x 14                       

= – 49√3

= 102.667 – 84.868 = 17.799 cm²

Hence, the area of minor segment is 17.799 cm² 

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