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Chapter Eleven

Area of Parallelograms and Triangles

TermDefinition
base of a parallelogram any side of a parallelogram
height of a parallelogram perpendicular distance between any two parallel bases
base of a triangle any side
height of a triangle the length of an altitude drawn to a given base
height of a trapezoid perpendicular distance between its bases
sector of a circle region of a circle bounded by a central angle and its intercepted arc. The formula for the area of a sector is similar to the formula for arc length.
segment of a circle region bounded by an arc and a chord.
center of a regular polygon center of its circumscribed circle
radius of a regular polygon radius of its circumscribed circle
apothem a segment drawn from the center of a regular polygon perpendicular to a side of the polygon. Its length is the height of an isosceles triangle that has two radii as legs.
central angle of a regular polygon has its vertex at the center of the polygon and its sides pass through consecutive vertices of the polygon.
composite figure figure that can be separated into regions that are basic figures, such as triangles, rectangles, trapezoids, and circles. To find the area of a composite figure, find the area of each basic figure and then use the Area Addition Postulate.
Created by: amgeometry
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