The area of a cirle is:
PI * r2
Where "r" is the radius, and PI is approximately 3.14.
Hint: A radius is half of the diameter.
Since: area = pi * radius2 Then: Radius = square root ( area / pi ) And: Diameter = radius * 2
16 cm
Multiply the diameter by 3.14 (pi).
Circumference of circle: 5.5 times pi
yes the radius is half the diameter. It goes from the edge of the circle to the centre.
Using 3.14 as Pi the area of circle is: 0
Diameter = 1/2 of the circle's radius. Diameter = 2 times the square root of (the circle's area/pi) Diameter = the circle's circumference/pi
If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.
A circle with a radius of 5.
The diameter of a circle is twice its radius.
Since: area = pi * radius2 Then: Radius = square root ( area / pi ) And: Diameter = radius * 2
16 cm
6647.61cm2
Multiply the diameter by 3.14 (pi).
Circumference of circle: 5.5 times pi
yes the radius is half the diameter. It goes from the edge of the circle to the centre.
Area of a circle = pi*radius2 measured out in square unitsfor pi use this number 3.14159and remember the radius of a circle = half the diameter.----------------------------------------------------------------Thus a circle with a 10 inch diameter would have an area of:Radius = diamiter/2, which is 10/2= 53.14159 * (5*5) = 78.53975 square inches