It is a geometric figure with 3 sides and 3 vertices, the isosceles triangle has 2 equal sides and one different; also has 3 angles 2 of them are equal.
The isosceles triangles all look the same.
The area of a isosceles triangle can be calculated using the following formula: if you know the length of one of the equal sides and the other side.
If you know the length of the one of the equal sides and the other side, you can calculate its area using the following formula:
$$"area" = (b * sqrt(a^2 - (b^2/4))) / 2 $$
$$a = "length of one of the equal sides"$$
$$b = "length of the other side"$$
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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