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Radius of a circle is half the diameter.
For any given circle draw a straight line from one point on the circulference, through the circle centre, to the opposite point on the circu,afenrece.
Then taking a rule measure the straight line distance. That is the diameter(d)
Half of this distance, that from the circle dentre to the circumference is the radius(r).
r + r = d
or
2r = d
or
r = d/2
From this straight line we can calculate both the area (A)and the circuference(C) by using the following eq'ns/
C = 2pir = pi*d
A = pi *r^(2)
'pi' is a constant for all circles. and the number 3.14 or 3.1416 or 22/7 are used in these APPROXIMATIONS.
What else can I help you with?
How do you calculate the radius given the diameter?
Radius of a circle = diameter/2
How do you calculate the cross sectional area of a circle?
We can calculate the area of a circle by using the formula areacircle pi times r2. We know that pi is about 3.14 and r is the radius of the circle. Πr2 Where: Π pi (3.14159265...) r radius of circle
How do you calculate the area of a circle when you know radius?
a=3.14xradius squared
How do you calculate the perimeter of a circle?
The perimeter or circumference of a circle = 2*pi*radius or pi*diameter
Draw a flowchart to calculate the area of a circle?
The area of a circle is: pi times radius squared
How do you calculate t radius of the circle?
Radius of a circle = diameter/2
C program on how to calculate circumference of a circle?
int radius = 2; int output; radius = radius * 2; output = radius * Math.PI; Console.WriteLine(output);
How do you calculate radius of the circle when you do not have diameter?
Double the Radius to Calculate the Diameter.
How do you calculate the radius given the diameter?
Radius of a circle = diameter/2
How do you calculate radius of rotation?
From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
How do you calculate radius of a circle?
Divide the diameter by 2.
How do you calculate for the area of a circle?
pi radius squared
How do you calculate the radius from the diameter of a circle?
The radius is one -half of the diameter. It is the distance from the circle center to any point on the circumference.
How do you calculate the radius of circle from crircumference?
Not sure about crircumference, but radius = circumference/(2*pi)
How do you calculate the volume of an cylindrical tank?
you calculate the Area of the circle at the end of the Cylinder and then multiply it by the lenght to the second circle at the end of the cylinder Circle area= Radius*Radius* pi pi being 3.14159265
How calculate surface area of a circle?
the area of the circle is Pi X Radius squared
How do you calculate the circumfrerence of a circle?
Circumference of a circle = 2*pi*radius or pi*diameter
