Mathematics

Question

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

1 Answer

  • variable "d" usually stands for diameter

    If given radius "r"
    2*r= d

    The circumference of a circle is
    [tex]C= 2 \pi r= \pi d[/tex]
    hence if given circumference
    [tex]d= \frac{C}{\pi} [/tex]

    The area of a circle is
    [tex]A= \pi r^2 = \frac{\pi}{4} d^2[/tex]
    hence if given area
    [tex]d= \sqrt{\frac{4A}{\pi}}[/tex]
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