Respuesta :

soooobored
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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