what is the formula for diameter and radius?

diameter = 2 * radius

Formula For Diameter

Formula For Radius

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what is the formula for diameter and radius?

ok i suck at math so ya i am doing my math home work i need help i know know know know i waited till the last minute but i always do that any way what is the formula for diameter and radius

Diameter = ( 2 ) ( Radius )

Radius = ( Diameter ) / ( 2 )

Diameter is twice the radius.

so d = 2r

also r = d/2

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radius is the measure from the center of a circle to the outside. diameter is a straight line connecting the center of a circle with two points on its perimeter. circumferene is another way of saying perimeter for a circle. it can be found with 2*pi*r pi is just a constant number. it is approximent value is 3.14159

Diameter = circumference/π.

Radius = circumference/(2π).

Circumference= πr^2

r= .5d

d=2r

c=2pie(r) or pie(d)

a= pie (r^2)