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If the radius of a circle is 7 cm, what is its area? (Take ╧А = 22/7)
154┬аsq┬аcm
144┬аsq┬аcm
164┬аsq┬аcm
134┬аsq┬аcm
154┬аsq┬аcm
Since the radius is a multiple of 7, use Pi = 22/7 to cancel the denominator directly and check divisibility by 11.
Radius r = 7 cm, Pi = 22/7
A=╧Аr2
Since the radius is a multiple of 7, use Pi = 22/7 to cancel the denominator directly and check divisibility by 11.
Confusing the area formula (╧Аr┬▓) with the circumference formula (2 ╧Аr).
Identify Given Values
Note down the given radius and the constant value for pi.
r=7┬аcm,╧А=722тАЛ
Substitute into Area Formula
Apply the area of a circle formula: A=╧Аr2.
A=722тАЛ├Ч72
Calculate Final Result
Simplify the calculation to obtain the final area.
A=22├Ч7=154┬аsq┬аcm
A is correct because the calculated area of the circle is 154 sq cm.
Mensuration questions in CBT-1 frequently test combinations of circles, sectors, and cylinders, where recognizing multiples of 7 saves time.
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