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A pond 100 m in diameter is surrounded by a circular grass walk-way 2 m wide. How many square metres of grass is the on the walk-way?
  • a)
    98 π
  • b)
    100 π
  • c)
    204 π
  • d)
    202 π
Correct answer is option 'C'. Can you explain this answer?
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A pond 100 m in diameter is surrounded by a circular grass walk-way 2 ...
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A pond 100 m in diameter is surrounded by a circular grass walk-way 2 ...
The radius of the pond is 100/2 = <100 =50="">>50 m.
The radius of the grass walkway is 50+2 = <50+2=52>>52 m.
The area of the grass walkway is pi*(52^2 - 50^2) = pi*(2704 - 2500) = pi*204
≈ 204*pi
≈ 204*3.14
≈ <204*3.14=640.56>>640.56 m^2.
So, the answer is a) 640.
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A pond 100 m in diameter is surrounded by a circular grass walk-way 2 m wide. How many square metres of grass is the on the walk-way?a)98πb)100πc)204πd)202πCorrect answer is option 'C'. Can you explain this answer?
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