What formulas/equations are used to find the diameter of a circle?

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asked May 16, 2018 92.7k views

1 Answer

Agung Prasetyo · Answer 1 · 2018-05-22T08:38:42+0000

variable "d" usually stands for diameter

If given radius "r"
2*r= d

The circumference of a circle is

$C= 2 \pi r= \pi d$
hence if given circumference

$d= (C)/(\pi)$

The area of a circle is

$A= \pi r^2 = (\pi)/(4) d^2$
hence if given area

$d= \sqrt{(4A)/(\pi)}$

What formulas/equations are used to find the diameter of a circle?

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