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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.
What else can I help you with?
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
Why is pie used to calculate properties of a circle?
The simple answer is that PI is what falls out when you study circles. If I had a circle that is 1 foot in diameter, then the circumference (or perimeter) is PI feet. The numerical value of PI wasn't chosen at random, it was found. As for the area of a circle, the perimeter of any object has a relationship to its area. So, PI again becomes important.
Who figured out the value of pi that is used to measure the area of circles?
Archimedes of Syracuse
How has pi changed math?
Pi has undoubtedly contributed to math. Pi can be used for calculating circles and was used to measure distances without doing it the harder way....
How can pi be used?
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
What are the two formulas pertaining to circles that pi is used in?
Angular measure of a circle: 2*pi radians. Circumference of a circle with diameter d units: d*pi units
How is pi used to find the circumference of circles?
Circumference of any circle = 2*pi*radius or pi*diameter
How is pi used to find circumference of circles?
Pi times the diameter of a circle gives its circumference.
What did people use pi for?
Pi is the ratio of a (perfect) circle's circumference to its diameter. It was, and still is, used to make more accurate measurements of things containing circles or parts of circles. Pi also shows up in trigonometry and higher maths.
When is pi used in equations?
Pi is used anytime there is a circular (as opposed to linear) geometry involved. Examples include circles, cylinders, spheres, and other cruves.
Why does Pi work for all circles?
Because all circles are similar.
Why does the Greek letter Pi signify the ratio of a circles circumference?
The Greek word for perimeter begins with the letter pi, and since circumference and perimeter are the same the letter Pi was used.
Where is pi found?
In circles in nature.
What is the answer to circles and circumference?
circumference = 2*pi*radius or pi*diameter
