# Formulario:Matemáticas - Geometría - Círculo

## Círculo

A circle is a basic shape consisting of the points at a given distance from a given point on a plane.

### Definiciones:

• d: Diámetro
• U: Perímetro
• A: Área

#### Circunferencia

The circumference U is the distance around a closed curve.

$${\color{blue} {U}} = 2 \times \pi \times {\color{red} {r} }$$
U = Perímetro

$${\color{red} {r}} = \frac{ {\color{blue} {U} } }{ 2 \times \pi }$$
U = Perímetro

$${\color{blue} {U}} = \pi \times {\color{red} {d} }$$
U = Perímetro
d = Diámetro

$${\color{red} {d}} = \frac{ {\color{blue} {U} } }{ \pi }$$
d = Diámetro
U = Perímetro

#### Área círculo

The region inside a circle.

$${\color{OliveGreen} {A}} = \pi \times {\color{red} {r} }^{2}$$
A = Área
$${\color{red} {r}} = \sqrt{ \frac{\color{OliveGreen} {A}}{\pi} }$$
$${\color{OliveGreen} {A}} = \frac{\pi}{4} \times {\color{red} {d} }^{2}$$
$${\color{red} {d}} = \sqrt{ \frac{4 \times {\color{OliveGreen} {A} } }{\pi}}$$