You must use the information that you do have about that cicle, along with the
equations and formulas you've learned that give the relationship between the
kind of information you have and the radius of cicles in general.
To find circumference you must multiply twice the radius by π, or using the diameter, if it gives it to you, multiply that by π.
circumference = pi * 2radius (diameter) so to find radius you use circumference/(2 x pi) this will find radius ----
The diameter is twice the radius. So multiply the radius by 2
you find the radius of a cone by the bottom of it or the round part
the radius is half the diameter
To find circumference you must multiply twice the radius by π, or using the diameter, if it gives it to you, multiply that by π.
90 degree
Diameter. Half of the width is called the radius.
That's called a radius.
Area of a circle = pi*radius squared
Assuming you know the radius - the formula is Pi x Radius2
because cicle sounds weird. r is used as an abbreviation for radius meaning half the diameter of the circle.
To find the diameter of a circle given the area. The area of a circle = pi x the radius squared. To find the radius, then the diameter transpose the area formula, so A = Π * r^2 A/ Π = r^2 √A/ Π= r 2 x √A/ Π = d A = area Π = pi = 3.142 r = radius d = diameter
The area of a circle is pi times radius times radius. 6 cm = 2 times 3 cm radius = 3 cm. SO, pi times 3 cm times 3 cm 9 pi pi is approximately 3.141592... 9 times 3.141592... is 28.274328...
12.5 km
the perimeter of a circle, also known as the circumference, is calculated by diameter multiplied by pi. Alternatively : 2 x radius x pi
You use the formula for the area of any circle:Area = (pi) x (radius)2and to find the radius to use in this formula, you remember thatRadius = 1/2 of the diameter.A couple of additional helpful facts:-- A convenient and quite accurate number to use for (pi) is 22/7 .-- The correct spelling of "circle" is "c i r c l e".