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Natali [406]
4 years ago
12

What is the number pie

Mathematics
2 answers:
MakcuM [25]4 years ago
3 0

You meant pi, pi is a irrational number, but they use 3.14 for approximation, so that is your answer.

Hope this helped!

Nate

frosja888 [35]4 years ago
3 0

\pi-\bold{pi}\\\\\pi\ \text{it's the ratio of a circle's circumference to its diameter}\\\\\pi=\dfrac{\text{circumference of a circle}}{\text{circle diameter}}\\\\\pi\ \text{it's irrarional number}\\\\\pi=3.14159265358979323846264338327...\\\\\text{Approximation of}\ \pi:\\\\\pi\approx3.14\\\\\pi\approx\dfrac{22}{7}\\\\\pi\approx\dfrac{355}{113}

The number pi occurs when calculating the surface area or volume of the rotational solids.

Cylinder:

S.A.=2\pi r^2+2\pi rH\\\\V=\pi r^2H

Cone:

S.A.=\pi r^2+\pi rl\\\\V=\dfrac{1}{3}\pi r^2H

Sphere:

S.A.=4\pi R^2\\\\V=\dfrac{4}{3}\pi R^3

The number pi occurs when calculating the area and the circumference of a circle.

C=\pi d=2\pi r\\\\A=\pi r^2

It is also used to convert angle measure in degrees to radians.

x^o=\dfrac{x\pi}{180}\ rad

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