The area of a semicircle can be calculated using the following formula: if you know the length of the radius.
If you know the length of the radius, you can calculate its area using the following formula:
$$"area" = (pi * r^2) / 2 $$
$$pi = "constant number"$$
$$r = "semicircle radius"$$
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.
It is the space of the internal surface in a figure, it is limited for the perimeter. Also, the area can be calculated in a plane of two dimensions.
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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