# What is the area of a circle with radius 15 miles

Here is the answer to questions like: how to find the area of a circle with radius 15 miles?

### Inputs:

 Radius: or Diameter or Circumference: Unit: inches feet yards miles kilometers meters centimeters millimeters

### Result:

The area of a circle with radius 15 is 706.9

### Formulae:

A = πr2 = π(d2)2
A = C2
π = 3.1415
A = area
C = circumference or perimeter
r = radius, d = diameter

### Area of a circle in terms of radius:

Area = π·r2 = 3.14·152 = 706.9 square miles(*)

### Area of a circle in terms of diameter:

Area = π·(d2)2 = 3.14·(302)2 = 3.14·(15)2 = 706.9 square miles(*)

### Area of a circle in terms of circumference:

Area = C2 = 94.252 = 8883.06(4·3.14) = 8883.0612.56 = 706.9 square miles(*)

(*) 706.8583470577 miles, exactly or limited to the precision of this calculator (13 decimal places).

Note: for simplicity, the operations above were rounded to 2 decimal places and π was rounded to 3.14.

### A circle of radius = 15 or diameter = 30 or circumference = 94.25 miles has an area of:

• 1830.86 square kilometers (km²)
• 1.83086 × 109 square meters (m²)
• 1.83086 × 1013 square centimeters (cm²)
• 1.83086 × 1015 square millimeters (mm²)
• 706.9 square miles (mi²)
• 2.18969 × 109 square yards (yd²)
• 1.97072 × 1010 square feet (ft²)
• 2.83784 × 1012 square inches (in²)

Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. You can also see at the bottom of the calculator, the step-by-step solution.

## Formula for area of a circle

Here a three ways to find the area of a circle (formulas):

A = πr2

A = π(d2)2

### Circle area formula in terms of circumference

A = C2

See below some definitions related to the formulas:

### Circumference

Circumference is the linear distance around the circle edge.

The radius of a circle is any of the line segments from its center to its perimeter. The radius is half the diameter or r = d2.

### Diameter

The diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. The diameter is twice the radius or d = 2·r.

### The Greek letter π

π represents the number Pi which is defined as the ratio of the circumference of a circle to its diameter or π = Cd . For simplicity, you can use Pi = 3.14 or Pi = 3.1415. Pi is an irrational number. The first 100 digits of Pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 ...

### Note:

If you input the radius in centimeters, you will get the answer in square centimeters (cm²), if in inches, will get the answer in square inches (in²) and so on ...

Circumference is often misspelled as circunference.

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