Areas of Circles and Sectors. Let’s say that you know that the circumference of a circle is 20 cm and that you want to calculate the radius from the circumference. Radius of a circle when circumference is given calculator uses. Given the radius or diameter and pi you can calculate the circumference. 7.G.4. The distance from one side of the circle to the other, going through the center of the circle, is the diameter. You can enter the circumference and also compute radius and diameter in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers. In this case it is 12. Just plug the value for the radius into the formula and solve. The radius of the circle is one half of the diameter, so the formula for the circumference is {eq}C=2\pi r {/eq} Answer and Explanation: We are given that the circumference of a circle is The radius is half the diameter, so the radius is 5 feet, or r = 5. How to calculate Radius of a circle when circumference is given using this online calculator? Furthermore, the circumference is the distance around the circle. Radius of a circle when circumference is given, 3 Other formulas that you can solve using the same Inputs, 5 Other formulas that calculate the same Output, Radius of a circle when circumference is given Formula. How to calculate Radius of a circle when circumference is given? Write down the formula for finding the circumference of a circle using the radius. What is Radius of a circle when circumference is given? 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Determine the radius of a circle. Circumference = 2 * pi * radius Diameter = 2 * radius Circles What is a circle? Perimeter of a Semicircle when circumference of circle is given, Perimeter=(Circumference of Circle/2)+Diameter, Area of a Circle when circumference is given, Area=((Circumference of Circle)^2)/(4*pi), Diameter of a circle when circumference is given, Radius=(Quantum Number*Plancks Constant)/(2*pi*Mass*Velocity), Radius=(Quantum Number/Atomic number)*0.529*10^-10, Radius of a circle when diameter is given, Minimum Distance Between Parallel Lines in 2D, Diameter of a circle when radius is given, Inscribed angle when radius and length for minor arc are given, Inscribed angle when radius and length for major arc are given, Central angle when radius and length for major arc are given, Central angle when radius and length for minor arc are given, Side of a Kite when other side and area are given, Side of a Kite when other side and perimeter are given, Side of a Rhombus when Diagonals are given, Area of regular polygon with perimeter and inradius, Measure of exterior angle of regular polygon, Sum of the interior angles of regular polygon, Area of regular polygon with perimeter and circumradius, Side of Rhombus when area and height are given, Side of Rhombus when area and angle are given, Side of a rhombus when area and inradius are given, Side of a Rhombus when diagonals are given, Side of a rhombus when perimeter is given, Side of a rhombus when diagonal and angle are given, Side of a rhombus when diagonal and half-angle are given, Diagonal of a rhombus when side and angle are given, Longer diagonal of a rhombus when side and half-angle are given, Diagonal of a rhombus when side and other diagonal are given, Diagonal of a rhombus when area and other diagonal are given, Diagonal of a rhombus when inradius and half-angle are given, Smaller diagonal of a rhombus when side and half-angle are given, Area of a rhombus when side and height are given, Area of a rhombus when side and angle are given, Area of a rhombus when side and inradius are given, Area of a rhombus when inradius and angle are given, Diagonal of a rhombus when other diagonal and half-angle are given, Area of a rhombus when one diagonal and half-angle is given, Inradius of a rhombus when height is given, Inradius of a rhombus when area and side length is given, Inradius of a rhombus when area and angle is given, Inradius of a rhombus when side and angle is given, Inradius of a rhombus when one diagonal and half-angle is given, Inradius of a rhombus when diagonals are given, Inradius of a rhombus when diagonals and side are given, Length of a chord when radius and central angle are given, Length of a chord when radius and inscribed angle are given, Value of inscribed angle when central angle is given, Length of arc when central angle and radius are given, Area of sector when radius and central angle are given, Midline of a trapezoid when the length of bases are given, Area of a trapezoid when midline is given, Radius of the circle circumscribed about an isosceles trapezoid, Radius of the inscribed circle in trapezoid, Sum of parallel sides of a trapezoid when area and height are given, Height of a trapezoid when area and sum of parallel sides are given, Third angle of a triangle when two angles are given, Lateral Surface area of a Triangular Prism, Height of a triangular prism when base and volume are given, Height of a triangular prism when lateral surface area is given, Volume of a triangular prism when side lengths are given, Volume of a triangular prism when two side lengths and an angle are given, Volume of a triangular prism when two angles and a side between them are given, Volume of a triangular prism when base area and height are given, Bottom surface area of a triangular prism when volume and height are given, Bottom surface area of a triangular prism, Top surface area of a triangular prism when volume and height are given, Lateral surface area of a right square pyramid, Lateral edge length of a Right Square pyramid, Surface area of an Equilateral square pyramid, Height of a right square pyramid when volume and side length are given, Side length of a Right square pyramid when volume and height are given, Height of a right square pyramid when slant height and side length are given, Side length of a Right square pyramid when slant height and height are given, Lateral surface area of a Right square pyramid when side length and slant height are given, Surface area of a Right square pyramid when side length and slant height are given, Volume of a right square pyramid when side length and slant height are given, Lateral edge length of a Right square pyramid when side length and slant height are given, Slant height of a Right square pyramid when volume and side length are given, Lateral edge length of a Right square pyramid when volume and side length is given. Then you can use the formula for the circumference of a circle to get the answer! This is the radius of a circle that corresponds to the specified circumference. In this formula, "r" represents the radius of the circle. In this formula, Radius uses Circumference of Circle. Using the Circumference Calculator. To get from the center point to the actual circle, we move in a straight line called a radius. $\begingroup$ "I know that the ratio of the circumference to the diameter is Pi" is incorrect, should also specify in Euclidean geometry to that sentence, try finding the ratio of circumference to the diameter on a sphere just for fun. The circumference of any circle is directly proportional to the diameter and the radius of the circle. The radius is half as long as the diameter, so the diameter can be thought of as 2r. Radius is a line from the center of a circle to a point on the circle or the distance from the center of a circle to a point on the circle. 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