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What is the perimeter of a semi-circle lake having a radius of 700m?
  1. 127.4 km
  2. 3.6 km
  3. 2.9 km
  4. None of these
Explanation

To find the perimeter of a semi-circle, we need to consider two parts:

  1. The half of the circumference of the circle, which is 12×2πr=πrfrac{1}{2} times 2pi r = pi r.
  2. The diameter of the circle, which is 2r2r.
  • The radius r=700r = 700 meters.

  1. Calculate the curved part (half of the circumference):


    text{Curved part} = pi times r = pi times 700 approx 3.1416 times 700 approx 2199.12 , text{m}

  2. Add the diameter:


    text{Diameter} = 2 times r = 2 times 700 = 1400 , text{m}

  3. Total perimeter:


    text{Perimeter} = text{Curved part} + text{Diameter} = 2199.12 , text{m} + 1400 , text{m} = 3599.12 , text{m}

  4. Convert the result to kilometers:


    3599.12 , text{m} = 3.6 , text{km}

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The area of a square with side 14 cm is?
  1. 256 cm²
  2. 196 cm²
  3. 224 cm²
  4. None of these
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What is the square of 2.5 cm?
  1. 5.25 cm²
  2. 6.25 cm²
  3. 7.25 cm²
  4. 8.25 cm²
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A circle has radius 7 cm, its diameter is?
  1. 12 cm
  2. 14 cm
  3. 16 cm
  4. None of these
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The perimeter of square whose side is 2.5 cm long is.
مربع کا دائرہ جس کی طرف 2.5 سینٹی میٹر لمبا ہے۔
  1. 10 cm
  2. 15 cm
  3. 20 cm
  4. 25 cm
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If one side of a regular hexagon is 7 cm, what is its perimeter?
  1. 35 cm
  2. 42 cm
  3. 49 cm
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