## What is the formula for circumference diameter?

C=𝜋d

Answer: The circumference of a circle can be calculated using either of the following formulas: C=𝜋d or C=2𝜋r. We know that the diameter of the circle is 8 cm, and an approximation for pi is 3.14, so we can plug these values into the formula C=𝜋d. The formula becomes C=(3.14)(8), which simplifies to 25.12.

## What is the circumference of a circle with diameter?

To calculate the circumference of a circle, multiply the diameter of the circle with π (pi). The circumference can also be calculated by multiplying 2×radius with pi (π=3.14).

**How do you find the diameter and area of a circle?**

The formula for the area of a circle is A = π r2, where r is the length of the radius of a circle. We can use our knowledge that a diameter is made up of two radii to understand that r = d/2. With this knowledge, you can rewrite the formula for the area of a circle as A = π (d/2)2.

**How do I find circumference of a circle?**

The circumference is the distance around a circle. In other words, it’s the perimeter of the circle. And we find the circumference by using the formula C = 2πr.

### How do you find the circumference with the area?

The formula C = 2√πA is designed to find a circle’s circumference using the area (A). Alternatively, you can solve the equation A = πR2 in reverse to find R, then plug R into the circumference equation. Both equations provide the same result.

### What is the area formula of a circle?

A = π r²

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.

**How do you find area with circumference?**

To find the area of a circle from the circumference, follow these steps:

- Divide the circumference by π.
- Divide the result by 2 to get the circle’s radius.
- Multiply the radius by itself to get its square.
- Multiply the square by π, or 3.14 for an estimation.
- You found the circle’s area from the circumference.

**What is the area formula?**

Area and Perimeter Formula Chart

Figures | Area Formula | Variables |
---|---|---|

Area of Square | Area = a2 | a = sides of the square |

Area of a Triangle | Area = 1/2 b×h | b = base h = height |

Area of a Circle | Area = πr2 | r = radius of the circle |

Area of a Trapezoid | Area = 1/2 (a + b)h | a =base 1 b = base 2 h = vertical height |

#### How do u calculate area?

To find the area of a rectangle or a square you need to multiply the length and the width of a rectangle or a square. Area, A, is x times y.

#### How do you do area of a circle?

The area of a circle is pi times the radius squared (A = π r²).