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If the radius of a circle is 7 cm, what is the length of its circumference? (Use ╧А = 22/7)
44┬аcm
22┬аcm
88┬аcm
154┬аcm
44┬аcm
Since the radius is 7, the 7 in the denominator of ╧Аcancels out directly, yielding 2├Ч22=44┬аcm instantly.
Radius r = 7 cm, ╧А=22/7
C=2╧Аr
Since the radius is 7, the 7 in the denominator of ╧Аcancels out directly, yielding 2├Ч22=44┬аcm instantly.
Confusing the circumference formula (2╧Аr) with the area formula (╧Аr┬▓).
Identify Given Data
Note down the given radius r=7┬аcm and constant ╧А=722тАЛ.
r=7┬аcm,╧А=722тАЛ
Apply Circumference Formula
The formula for the circumference of a circle is given by C=2╧Аr.
C=2╧Аr
Calculate Final Value
Substitute the values into the formula: C=2├Ч722тАЛ├Ч7=44┬аcm.
C=44┬аcm
A is correct because the calculated length of the circumference is 44┬аcm.
Mastering basic circle formulas is essential for solving complex cylinder, cone, and sphere surface area problems in RRB JE CBT-1.
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