The area of a trapezoid can be calculated using the following formula: if you know the perimeter of the two triangles formed in the trapezoid.
If you know the length of the line that make the two triangles, you can calculate its area using the following formula:
$$"area" = A1 + A2$$
$$A1 = "Area of the First Triangle"$$
$$A2 = "Area of the Second Triangle"$$
It is a geometric figure with 4 sides, it has two parallel lines. All trapezoids have different angles.
A trapezoid can have vitually infinite posibles shapes, Despite this all have 4 sides and all this angles are different.
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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