## What is the surface area of 3 circles?

Circumferences and areas of circles with diameters in inches.

Diameter (in) | Circumference (in) | Area (in2) |
---|---|---|

3 1/8 | 9.82 | 7.67 |

3 3/16 | 10.01 | 7.98 |

3 1/4 | 10.21 | 8.30 |

3 5/16 | 10.41 | 8.62 |

**How do you measure inches in a circle?**

You can calculate the circle’s circumference in inches with pi in the equations circumference = 2 * radius * pi and circumference = diameter * pi. Locate the circle’s center, and measure the length from its center to a point on its edge to find the radius. For an example, suppose the measurement is 5 inches.

**How big is a 3 inch circle?**

How big is a 3 inch circle? The area of a circle is pi times the square of its radius. The radius is half the diameter. The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

### How to find the area of a circle diameter?

Area of a circle diameter. The diameter of a circle calculator uses the following equation: Area of a circle = π * (d/2) 2. Where: π is approximately equal to 3.14. It doesn’t matter whether you want to find the area of a circle using diameter or radius – you’ll need to use this constant in almost every case.

**How do you find the radius of a circle?**

Area of a circle radius. The radius of a circle calculator uses the following area of a circle formula: Area of a circle = π * r 2 Area of a circle diameter.

**How do you find the area of a cricle?**

Task 1: Given the radius of a cricle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 5 2 = 3.14159 x 25 = 78.54 sq in. Task 2: Find the area of a circle given its diameter is 12 cm. Apply the second equation to get π x (12 / 2) 2 = 3.14159 x 36 = 113.1 cm 2 (square centimeters).