Instruction
1
In the simplest case, if you construct a circle of radius R, then its diameter will be equal to
D = 2 * R
If the radius of the circle is not known, but is known for its length, the diameter can be calculated according to the formula of length of circumference
D = L/N where L is the length of the circumference, N is the number of P.
The diameter of the circle can be calculated by knowing the area of a circle it limited
D = 2 * v(S/P), where S is the area of a circle, N is the number of P.
D = 2 * R
If the radius of the circle is not known, but is known for its length, the diameter can be calculated according to the formula of length of circumference
D = L/N where L is the length of the circumference, N is the number of P.
The diameter of the circle can be calculated by knowing the area of a circle it limited
D = 2 * v(S/P), where S is the area of a circle, N is the number of P.
2
In special cases the radius of the circle can be found if it is described or inscribed in a triangle.
If the circle inscribed in a triangle, then its radius is given by
R = S/p where S is the area of a triangle, p = (a + b + c)/2 – properiter triangle.
If the circle inscribed in a triangle, then its radius is given by
R = S/p where S is the area of a triangle, p = (a + b + c)/2 – properiter triangle.
3
For the circledescribed about a triangle, the formula for the radius has the form
R = (a * b * c)/4 * S, where S is the area of a triangle.
R = (a * b * c)/4 * S, where S is the area of a triangle.
