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Question: The diameter of a circular lawn is 18 m. Calculate its area.
[Take π = 3.14.]


A ) 254.34 m2
B ) 28.26 m2
C ) 1017.36 m2
D ) 56.52 m2

Steps to derive

1 Area of a circle, A = πr2, where r is the radius of the circle.
 [Formula.]

2 Radius = diameter2 = 182 = 9
 [Substitute and divide.]

3 A = 3.14 × (9)2
 [Substitute 9 for the radius and 3.14 for π.]

4 A = 254.34
 [Multiply.]

5 So, the area of the circular lawn is about 254.34 m2.



Hence the right answer is Option A

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