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The number pi is a part of every circle's formula because there is a fundamental relationship between the diameter (d), or radius (r), if you prefer, and the circumference (c) of every circle, regardless of its size, and the relationship is expressed in one of two ways: c = pi d c = 2 pi r Both expression say the same thing, and either (both) apply to every circle you can construct in planar space.
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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 is the ratio of PI circles?
In a circle Pi it the ratio of the circumference to the diameter. That is to say, if C is the cirumference and D is the diamter of any circle, we have: Pi=C/D
What does circle have to do with math?
Circle is a shape. We have gotten to know a lot from circles. Because of circles, we get PI, radius, diameter, circumference, and other things. Circles fall into geometry, which is math. We can make many mathematical equations from circles.
What is the area between two circles with the same centre and of radii 5cm and 9cm respectively?
It is pi*(92 - 52) = pi*(81 - 25) = pi*56 = 175.93 cm2
What is the circles diameter if the circumference is 31.4?
It is: diameter = 31.4/pi which is about 10 units
What is the formula for the area of circles?
pi (r^2)
Why is pi in cylinder formula?
Because the bases of the cylinder are circles.
What is the formula for calculating a circles perimeter?
2,,r or ,,d 2x pi x radius or Pi x Diameter
How big of circles can you calculate their circumference?
Any circle's circumference can be calculated with the formula 2(pi)*radius
How can pi be used?
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
Why is pi used in every circle formula?
By definition Pi is the relation between the radius and circumference of a circle.
What formulas use Pi in the equation?
a formula that uses pi is the circumference and area of a circle and every polyhedron that has a circle
Why does Pi work for all circles?
Because all circles are similar.
Where is pi found?
In circles in nature.
What is the answer to circles and circumference?
circumference = 2*pi*radius or pi*diameter
How do you find the area of 1 face of a cylinder?
Faces of cylinder are circular therefore area must be pi*radius*radius That is the formula for the top and bottom faces, the circles. However, the main face, the face connecting the two circles, is really a large rectangle bended to fit with the circles. The height of the rectangle is the same as the height of the cylinder. The width of the rectangle is the circumference of the circle (pi * 2 * radius). The formula for a rectangle is width * height. So, the side face is height of cylinder * circumference of circle (pi * 2 * radius.)
Why use pi?
Pi is very important for finding circumfrences and area's of circles.
