SAT Subject Test Mathematics Level 1

Remember that to find the area of a parallelogram, you need the height,
which is the perpendicular distance from the base to the opposite side. You
can use a side of a parallelogram for the height only when the side is
perpendicular to the base, in which case you have a rectangle.

FIVE SPECIAL QUADRILATERAL TYPES

Rectangles: A rectangle is a four-sided figure with four right angles. Opposite
sides are equal. Diagonals are equal. The perimeter of a rectangle is equal to
the sum of the lengths of the four sides, which is equal to 2(length + width).

Area    of  Rectangle   =   length  ×   width

1. Trapezoid:   Exactly one pair    of  parallel    sides.

Parallelogram:  Two pairs   of  parallel    sides.

Area    of  Parallelogram   =   base    ×   height

2.

Rectangle:  Four    right   angles Perimeter    of  Rectangle   =   2(length    +

width) Area of  Rectangle   =   length  ×   width

3.

Rhombus:    Four    equal   sides Perimeter of  Rhombus =   4   ×   side Area

of  Rhombus =   base    ×   height

4.

Square: Four    right   angles  and four    equal   sides Perimeter of

Square  =   4   ×   side Area   of  Square  =   (side)^2

5.