To find the circumference of a circle, we use the formula:
\[ C = 2\pi r \]
Where \(C\) is the circumference, \(\pi\) is approximately 3.14, and \(r\) is the radius of the circle.
From the provided measurements, the only value that seems relevant to calculate the circumference is 31.40in, which could represent the diameter of the circle.
If 31.40 in is the diameter, we can find the radius by dividing the diameter by 2:
\[ r = \frac{31.40}{2} = 15.70 \text{ in} \]
Now, we can substitute the radius back into the circumference formula:
\[ C = 2 \times 3.14 \times 15.70 \]
Calculating that:
\[ C = 6.28 \times 15.70 \approx 98.756 \text{ in} \]
So, the circumference of the circle is approximately 98.76 inches.
None of the other measurements given (78.5 in, 31.40 in², or 78m5 in²) directly relate to the radius or diameter needed for this calculation.
Thus, the best answer in this scenario is:
98.76 in.
1 answer