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Perimeter of a Semicircle Formulas & Calculator

The perimeter of a semicircle can be calculated using the following formula: if you know the length of the radius.

Formula Knowing the radius

If you know the length of the radius, you can calculate its perimeter using the following formula:

Semicircle Perimeter

$$"perimeter" = r(2 + pi)$$

Radius Length

Perimeter result

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Where:

$$pi = "constant number"$$
$$r = "circle radius"$$

Semicircle Definition

A semicircle is a shape or figure that is represented for half circle. It has 180º arc.

The semicircle is a very basic geometric shape and a very common appearance in nature.

Perimeter Definition

A perimeter is defined by the outer path of a shape. The shape is always in 2 dimensions. The perimeter is the total length of the exterior path. Another way of looking at this is to think of it as the boundary length of a shape.

In the case of a circle, the perimeter is called a circumference.

Perimeter has a Greek origin, "peri" means "around", and "meter" means "measure". So perimeter means "measure around".

Formula Definition

It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".


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