Here we will answer the following three questions. a) What is 1971Pi? (What is 1971π?), b) What is the area of a circle if the radius is 1971?, and c) What is the circumference of circle if the radius is 1971?
1971π is another way of writing 1971 times Pi (1971 x 3.14). Therefore, the answer to our first question is:
1971π = 6192.08
Area: Next, we will calculate the area of a circle if the radius is 1971. The formula for the area of a circle is πr2, which means that the area of a circle with a radius of 1971 is:
π19712 = 12204587.95
Circumference: Finally, we will calculate the circumference of a circle if the radius is 1971. The formula for the circumference of a circle is 2πr, which means that the circumference of a circle with a radius of 1971 is:
2π1971 = 12384.16
Note: π or Pi has an infinite number of decimals. For our calculations on this page with a radius of 1971, we used Pi with eleven decimals as 3.14159265358 and then we rounded all our answers to two decimals.
Helpful Definitions:
Radius: The distance between the center of a circle to the edge of the circle. In our example on this page it was 1971.
Diameter: The distance between one side of a circle to the exact opposite side of the circle. This is the same as 2 times radius. (For example, if the radius is 1971, then the diameter must be 3942.)
Pi: The ratio of a circle's circumference to its diameter. This is a fixed number regardless of circle size.
We used the following formulas on this page, where A is Area of circle, C is Circumference of circle, and r is radius:
A = πr2
C = 2πr
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