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# Define radius of a circle

Updated: 12/23/2022

Wiki User

13y ago

In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.

Wiki User

13y ago

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Q: Define radius of a circle
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### What undefined term is needed to define a circle?

A point. To learn why and more about circles go to this website: windowseat.ca/circles

### Define pi and write a brief history of pi?

pi is the ratio between the radius and the circumference of the circle if the radius is 1 the circumference is pi

### How do you write a c program to calculate the circumference of the circle using macros with parameters?

// macro definitions: #define PI 3.14159265358979323846 #define CIRCUMFERENCE(radius) (2. * (radius) * PI) // use this as in CIRCUMFERENCE(21.34)

Yes

### Does the radius come before the diameter?

Both the radius and the diameter are measurements which define a circle. The diameter is the distance straight across a circle from one edge to the other, passing through the midpoint of the circle. The radius is half of the diameter. Therefore, it is incorrect to say that either comes before the other.

### If a circle is placed inside an 800ft squared area what is the radius of the circle?

Well, since the circle is inside the square, the edges of the square define the limits of the circle. Since we have a square, the length of each side is the square root of 800ft. The radius of the circle is half the length of the sides. Therefore, the answer is half of (the square root of 800), which makes for an ugly radius value of "14.142135623730950488016887242097" ft

### What does the r in the circumference formula?

The variable r in geometry equations referrs to the radius. The radius is the distance between the center of the circle and its edge, such that 2 x r = d where d = diameter (width). You can define the size or volume of a circle or sphere simply by knowing its radius.

### What is the radius of a circle where d is the diameter of the circle?

the radius of a circle is r

### Wha is the radius of a circle?

The radius of a circle is half the circle's diameter

### What is the radius of the circle equal to?

Radius of a circle= Perimeter of the circle/2*pi Radius is half the diameter Radius is the length of a straight line from the center point of the circle to the edge of the circle.

### If the radius of a circle is r what is the diameter of the circle?

The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.