Area of Parallelograms, Triangles, Rhombi, and Trapezoids
The formulas for finding the areas of these figures are very similar, and they are also connected.
Parallelogram
A=bh
Remember, height (h) is not the length of the side, but the distance between the bases.

b= base
h=height
Triangle
A=1/2 bh
As with parallelograms, the height is the length of the altitude.

b= base
h= height
Trapezoid
First, you find the average of the bases and multiply it times the height. If the bases have lengths of b
1 and b2, then the equation is

A= h 1/2 (b1 + b2)
Rhombus
If a rhombus has diagonals of d
1 and d2, then the area =

A=1/2 d1d2
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