## How do you convert area to radius of a circle?

As we know that, area of circle is given by: π ⋅ r2 where r is the radius of the circle. As we know that, if y = f(x), then dy/dx denotes the rate of change of y with respect to x. Hence, the rate of change of the area of a circle with respect to its radius r when r = 6 cm is 12π cm.

## How do you calculate radius from perimeter?

Divide the circumference by π. Divide the result by 2 to get the circle’s radius.

**How do you convert diameter to radius?**

Just remember to divide the diameter by two to get the radius. If you were asked to find the radius instead of the diameter, you would simply divide 7 feet by 2 because the radius is one-half the measure of the diameter.

**What is the formula to find the radius of a circle?**

Circle Formulas in terms of Pi π, radius r, and diameter d Radius and Diameter: r = d/2 d = 2r Area of a circle: A = π r 2 = π d 2 /4 Circumference of a circle: C = 2 π r = π d. Circle Calculations:

### How many radiuses are in a diameter?

A diameter is just two radiuses drawn in opposing directions from the circle’s origin. Dimensions of a Circle For a circle, three lengths most commonly are applied: The radius – defined above

### What does radius mean?

“Radius” – The distance of a straight line that extends from the center of the circle to the edge of the circle. If you know the circumference of a circle, you can calculate the radius based on the following formula: ϖ = Pi = 3.14159265…

**How do you find the radius of a surface area?**

Sphere surface area to radius calculator. User Guide. This tool will calculate the radius of a circle from the circumference, and will convert different measurement units for circumference and radius. Formula. The formula used to calculate the circle radius is: r = C / (2 · π) Symbols. r = Circle radius. C = Circle circumference.