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Base of a Parallelogram

Any side of a parallelogram.

Height of a Parallelogram

The perpendicular distance between any two parallel bases.

Area Addition Postulate

(Postulate) The area of a region is the sum of the areas of its non-overlapping parts.

Area of a Parallelogram

The area of a parallelogram is the product of a base and its corresponding height. A=bh

Area of a triangle

A = ½ bh (or) A = bh÷2

Height of a Trapezoid

the perpendicular distance between the bases

Area of a trapezoid

1/2 (b+b)h or mh

Area of a Rhombus or a Kite

Area equals one half the product of the diagonals.

Area of a Circle

pi r ^ 2

Sector of a Circle

region bounded by an arc of the circle and the two radii to the arc's endpoints; names using one arc endpoint, the center of the circle, and the other arc endpoint

Apothem

The perpendicular distance from the center to a side of a regular polygon.

Central Angle of a Regular n-gon

Angle measure is equal to 360/n, where n is the number of sides of the regular polygon.

Area of a Regular Polygon

The area of a regular n-gon with sides length s is half the product of the apothem a and the peroimeter P, so A=1/2aP, or A=1/2a*ns.

composite figure

a figure made up of two or more figures

Areas of Similar Polygons

If two polygons are similar with the lengths of corresponding sides in the ratio of a:b, then the ratio of their areas is a ²:b ².