# Simple Area Calculator

Area turns out to be that quantity which helps to express extent of a 2 – D figure or for that matter the shape or a planar lamina in the plane. There is another term related to area & it is known as surface area which is nothing but the area of the boundary surface.

## Surface Area Calculator

 Side Length(a): Radius(r): Units: meters (m) centimeters (cm) millimeters (mm) yard (yd) feet (ft) inches (in) Surface Area:

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### Formulae required for an area calculator

1. Area of a circle is:
$$A=\pi r^{2}$$
2. Area of a rectangle is:
$$A=wl$$ where  l is the length & w is the width
3. Area of a triangle is :
$$A=\frac{h_{b}b}{2}$$ where b is the base & $$h_{{b}}$$ is the height
4. Area of a trapezoid is:
$$A=\frac{a+b}{2}h$$ where a & b are the base while h is the height
5. Total area of a sector is:
$$\frac{1}{{2}}(\frac{\theta}{\pi}) r^{2}$$ here r is the radius & angle is denoted by $$\theta$$
6. Area of a parallelogram is:
$$A=bh$$where b is the base & h is the height
7. Area of a square is:
$$A= a^{2} \quad where \quad a \quad is \quad the\quad side$$
8. Area of a polygon is:
$$A=\frac{n}{4} s^{2}.cot(\frac{\pi}{n})$$where n is thenumber of sides & s is the length of the side (each one)
9. Area of an ellipse is:
$$A=\pi$$a b and here, a & baretheAxis
10. Area of a rhombus is:
$$A=\frac{p\quad q}{2}$$where p & are the diagonal
11. Area of a regular hexagon is:
$$A=\frac{\sqrt[3]{3}}{2} a^{2} \quad where \quad a \quad is \quad the \quad side$$
12. Area of an octagon is:
$$A=2(1+\sqrt{2}) a^{2} \quad where \quad a \quad is \quad the \quad side$$