The standard notation for area is A.
Let's a square side is long a then area formula is:
Let's a rectangle sides are long a and b
Let's palallelogram sides are long a and b and
ha is the altitude to the side a,
and hb is the altitude to the side b
Parallelogram area formula is:
Parallelogram area formula explained.(a java applet will be opened in a new window).
Say the length of the parallel sides of a trapezoid are long a and b and the distance between the two bases is h(the trapezoid altitude). The area formula is:
TriangleABC is triangle
A = ½(ab.sinC) = ½(ac.sinB) = ½(bc.sinA)