# What is the area of the radius of 5?

## How big is a circle with a radius of 5?

For Circles with Known Radius A circle with a radius of 5 units has a circumference of 31.416 units.

The radius is half the diameter, so the radius is 5 feet, or r = 5. You can find the circumference by using the formula. So, the circumference is about 31.5 feet around.

What is the diameter of 5 in?

Area and circumferences of circles with diameters in inches

Diameter (in) Circumference (in) Area (in2)
5 3/8 16.89 22.69
5 7/16 17.08 23.22
5 1/2 17.28 23.76
5 9/16 17.48 24.30

### 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.

### What is the area of semi circle of radius 5cm?

The area of a semicircle of radius 5 cm is 39.25 sq.cm.

What are the formulas for circles?

We know that the general equation for a circle is ( x – h )^2 + ( y – k )^2 = r^2, where ( h, k ) is the center and r is the radius.

What is the diameter when circumference is 5?

The diameter is 3522 .

#### What is the radius of a 13 inch circle?

∴ , the radius is 132 units or 7.5 units.

#### What is the area of a circle with radius of 5?

How to find the area of any a circle given its radius. The area of a circle with radius of 5 is equal to 78.54. See the solution steps here.

How to calculate the radius of a sphere?

Sphere surface area to radius calculator; User Guide. This tool will calculate the radius of a circle from the area, and will convert different measurement units for area and radius. Formula. The formula used to calculate the circle radius is: r = √(A / π) Symbols. r = Circle radius; A = Circle area; π = Pi = 3.14159… Area of Circle

Is the radius of a circle a real number?

A set of points in a plane equally distanced from a given point O O is a circle. The point O O is called the center of the circle. The distance from the center of a circle to any point on the circle is called the radius of this circle.A radius of a circle must be a positive real number.

## When do you need to know the area of a circle?

Circles are used when planning athletic tracks, recreational areas, buildings, and roundabouts, so knowing their area is important in construction, landscaping, etc. The famous Ferris-wheel attraction is a circle, as are the wheels on your car or bike.