The answer depends on what information about the circle is given: area, radius, length and angle of arc, area and angle of sector, etc. In each case, there is a different way to calculate the diameter but, since there is no information on what is known, it is not possible to answer the question.
circle diameter minus center of pitch cirlce raius
Circumference = diameter*pi
Double the Radius to Calculate the Diameter.
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
Take out the diameter of the outer circle from the distance between the two. Gives you the diameter of the inner circle then pi r squared it.
circle diameter minus center of pitch cirlce raius
Radius of a circle = diameter/2
Radius of a circle = diameter/2
Doubling the radius will give the diameter and times this by pi will give the circumference of the circle.
Circumference = diameter*pi
Divide the area by Pi to get the diameter.
Double the Radius to Calculate the Diameter.
Divide the diameter by 2.
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
Take out the diameter of the outer circle from the distance between the two. Gives you the diameter of the inner circle then pi r squared it.
Circumference of a circle = 2*pi*radius or pi*diameter
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203