The perimeter of a right triangle can be calculated using the following formula: if you know the length of the 2 sides that make the 90º angle.
If you know the length of the three sides, you can calculate its perimeter using the following formula:
$$"perimeter" = a + b + c$$
$$a = "length of the base side"$$
$$b = "lateral side"$$
$$c = "oposite sides"$$
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If you know the length of the two sides, you can calculate its perimeter using the following formula:
$$"perimeter" = a + b + sqrt(a^2 + b^2)$$
$$a = "base side"$$
$$b = "lateral side"$$
It is a geometric figure with 3 sides and 3 vertices, the right triangle always have one 90º angle; also has 3 angles.
The right triangles will have always 3 sides and one right angle.
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".
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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