A circular track has a radius of 21 m. Find its circumference. (Use pi = 22/7.)
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Step-by-Step Solution
Step 1: Identify the given values
The problem provides the radius of the circular track, r=21 meters, and specifies that we should use the approximation π=722 for the value of pi.
Step 2: Recall the formula for circumference
The circumference of a circle is the distance around its edge. The formula to calculate the circumference (C) of a circle with radius (r) is C=2πr.
Step 3: Substitute the values into the formula
Now, we substitute the given values of the radius (r=21) and π=722 into the circumference formula.
Step 4: Calculate the circumference
Perform the multiplication. First, simplify by dividing 21 by 7, which gives 3. Then multiply 2×22×3 to get the final circumference.