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Pi is the ratio of the circumference ( the perimeter) of a circle to its diameter.
You might have learned in school that if C is the circumference of the circle., then C=2Pir or C=pixd
from which we say pi = C/d or the ratio of the circumference of the circle to its diameter.
This has been known since ancient times! William Jones gave us the symbol we currently use for it. This comes from the 16th letter in the Greek alphabet.
So we use it to measure circles because of what it is.
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How is pi used to find circumference of circles?
Pi times the diameter of a circle gives its circumference.
How is pi related to circles?
Pi is related to circles as it is used to measure the area, circumference, surface area and volumes of any 2-D or 3-D shape that has circles or circle-related surfaces. In the case of area of a circle, it is measured as pi x r x r, OR pi x r2 where r is the radius of the circle. The relation between the radius and the circumference is also shown by by pi; circumference / diameter ( or 2 x radius) = Pi OR circumference = pi x diameter = 2 x pi x r All related shapes like cones, cylinders, spheres, toruses, and even doughnuts can be measured using Pi. Pi is usually given as 22/7, which doesn't even come that close. Another common value is 3.14, which is the cut off form of its value.
How is pi used in basketball?
Pi is used in basketball to measure the curcumference of diameter in the basketball itself, the hoop, the rim, and the ring that the players do the jump ball in.-Sanderson Pickweal .
What is circumference of a circle in terms of pi?
The circumference of a circle is 2 pi r, where r is the radius, or it is pi d, where d is the diameter.there is no circuference of pi. Circumference refers to the outer edges of circles
What is the relationship between a circles circumference and it's radius?
C=2(pi)r
