quadrilateral
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There are 2 types of trapeziums: One with two slanted sides, and one with 1 To make a two slanted sided trapezium you make a rectangle with sides a and b and put two triangles of equal length on each side. To make a one slanted sided trapezium you do the same thing except with one triangle on only one side.
a rhombus
Oh honey, a parallelogram is like a rectangle that's been through a bad breakup - its opposite sides are parallel but not necessarily equal in length. So, picture a wonky rectangle with slanted sides, and you've got yourself a parallelogram. It's like a square that's had a few too many drinks and is leaning to one side.
boom *(:
Divide the area by the known side.