Multiple choice

In a circular park of diameter 200 m, a flower bed is made in the form of a circle with radius 20 m. Find the approximate area of the park left out. (Take π = 22 7 )

  1. 20456.77 m2

  2. 34560.99 m2

  3. 30171.43 m2

  4. 30046.73 m2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Area of park = pi * R^2 = (22/7) * 100^2 = 220000/7 = 31428.57. Area of flower bed = pi * r^2 = (22/7) * 20^2 = 8800/7 = 1257.14. Remaining area = 31428.57 - 1257.14 = 30171.43.

AI explanation

The large park has a radius of 100 meters and the flower bed has a radius of 20 meters. Using the area formula pi times r squared, the difference between the areas is 22 over 7 times the quantity 10,000 minus 400, which is 22 over 7 times 9,600. This calculation results in an approximate remaining area of 30,171.43 square meters.

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