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In Mathematics / Middle School | 2014-08-07

A circle has an area of 19.625 square units.
Given \(\pi = 3.14\),
what is the circumference?

Asked by markopolo

Answer (2)

The formula for the area of ​​a circle: π ∗ r 2 , where r is radius of circle π ∗ r 2 = 19.625∣ : π r 2 = π 19.625 ​ ∣ ​ r = 3.14 19.625 ​ ​ = 2.5 The formula for the circumference of a circle: 2 ∗ π ∗ r , where r is radius of circle 2 ∗ π ∗ r = 2 ∗ 3.14 ∗ 2.5 = 15.7 units squared As can be seen easily calculated radius of the circle first, and then used this to calculate the circumference of the circle.

Answered by MattD | 2024-06-10

To find the circumference of a circle with an area of 19.625 square units, we first calculated the radius using the area formula, finding that the radius is 2.5 units. We then used the circumference formula to find that the circumference is approximately 15.7 units.
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Answered by MattD | 2024-09-30

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