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How do you find the radius using the circumference?
The equation for circumfrance is 2(pi)r (pi meaning the constant 3.14159, rounded). To find the radius if the circumfrance is known, you would re-arrange this equation to solve for r - it would go from C=2(pi)r into r=C/2(pi). c = circumference, r = radius. If the circumference is 2*pi*r, then r = c/(2*pi)=
How do you work out the circumfrance of a circle?
You press pi button on the calculator or type in 3.14 you then times it by the radius then square it. :) x
Why is pi used to measure circles?
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 does pi in geometry mean?
Pi or π is a constant which represents the ratio of any circles's circumference to its diameter. which is always equal to 22/7 or 3.142any shape that has a curve in it (e.g circle) is related to pi....For example:1.area of a circle= πr22.perimeter of a circle= 2πr
How is pi used to find circumference of circles?
Pi times the diameter of a circle gives its circumference.
