Table of Contents

## What is the radius of half?

The radius of a circle is the length of the line segment from the center of a circle to a point on the circumference of the circle and diameter is a line segment from one end of the circle to the other end of the circle passing through the center of the circle. So, the radius is half the length of the diameter.

**What is the area with a radius of 3?**

Radius of a circle = 3 cm. The area of that circle. r = Radius. \therefore∴ The Area of the circle is 28.26 cm².

**How can I calculate radius?**

How to Find the Radius of a Circle?

- When the diameter is known, the formula for the radius of a circle is: Radius = Diameter / 2.
- When the circumference is known, the formula for the radius is: Radius = Circumference / 2π
- When the area is known, the formula for the radius is: Radius = ⎷(Area of the circle / π)

### What is the circumference with a radius of 3?

Explanation: The formula for finding the circumference is 2πr . We can plug in 3 for r, getting 2π3 .

**Is radius just half of diameter?**

Radius and diameter are close friends – a circle’s radius is half the length of its diameter (or: a circle’s diameter is twice the length of its radius).

**How do you draw a radius of a 3cm circle?**

Step 1: Draw a circle with centre O and radius 3 cm using a compass.

- Step 2: Draw a secant passing through the centre.
- Step 3: Place the compass on P and draw two arcs on opposite sides of OP.
- Step 6: Mark the intersection points of the circle drawn from M1 with the circle drawn from O as A and B.

#### What is the area of the radius is 4?

16π sq. units

Answer: The area of the circle with a radius of 4 units is 16π sq. units.

**Is radius a distance?**

The radius around a particular point is the distance from it in any direction. Nick has searched for work in a ten-mile radius around his home. The radius of a circle is the distance from its center to its outside edge.

**What is the formula of diameter and radius?**

The formula for the radius can be written as r=d2, and the formula for diameter can be written as d=2r.

## What is the circumference with a radius of 4?

8 π

Answer: The circumference of a circle with a radius of 4 is 8 π.

**What is the circumference of 3 inches in mm?**

What is the circumference of 3 inches in mm?

Inches | Millimeters |
---|---|

1″ | 25.4 mm |

2″ | 50.8 mm |

3″ | 76.2 mm |

4″ | 101.6 mm |

**How to find the radius of a circle?**

This distance is called the radius of the circle. Which of the segments in the circle below is a radius? The diameter is the length of the line through the center that touches two points on the edge of the circle. Which of the segments in the circle below is a diameter? Find the diameter of the circle shown below.

### Are there any radians in a half circle?

1 Radian. In a half circle there are π radians, which is also 180°. To go from radians to degrees: multiply by 180, divide by π. Here is a table of equivalent values:

**What is the diameter and the radius?**

Diameter Which is the circle’s ‘width’. The diameter is two times the radius. See diameter of a circle. Circumference The circumference is the distance around the edge of the circle. See Circumference of a Circle for more.

**Which is the plural form of the radius of a circle?**

The radius of a circle is the length of the line from the center to any point on its edge. The plural form is radii (pronounced “ray-dee-eye”). In the figure above, drag the orange dot around and see that the radius is always constant at any point on the circle.