P = 2 πr

A = πr2

A = area

P = Perimeter

d = diameter

r = radius

A circle is a two-dimensional shape consisting of all points in a plane that are at a given distance, called the radius, from a fixed point known as the center. The properties of a circle include the perimeter, which is the distance around the circle, and the diameter, which is twice the length of the radius and passes through the center. All radii in a circle are equal in length. Circles are fundamental shapes in geometry and have various applications in mathematics, design, engineering, and nature.

Let's assume we have a circle with a radius of **r = 7 cm**.

The perimeter **C** is calculated using the formula:

**C = 2 · π · r**

Since **π ≈ 3.14159**, we can calculate the perimeter:

**C = 2 · 3.14159 · 7**

**C = 43.98226 cm**

The area **A** is calculated using the formula:

**A = π · r^2**

Now we can calculate the area:

**A = 3.14159 · 7^2**

**A = 3.14159 · 49**

**A = 153.93804 cm²**

**Radius of the circle:** r = 7 cm

**Circumference of the circle:** C ≈ 43.98226 cm

**Area of the circle:** A ≈ 153.93804 cm²

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