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Unit 12

Unit 12 Area and Perimeter of Geometric Shapes

perpendicular Two lines that meet at a point and form right angles (90°) to each other.
parallel Lines in the same plane that never intersect and remain the same distance apart from each other.
quadrilateral A four-sided polygon.
altitude A perpendicular distance from a vertex to its opposite side in a polygon.
supplemental angles Two angles whose measures have a sum of 180°.
parallelogram A quadrilateral with both pairs of opposite sides parallel. Opposite sides lengths are congruent and opposite angles are equal measures. Consecutive angles are supplementary angles.
trapezoid A quadrilateral with only one pair of parallel sides.
triangle A polygon with three sides and three angles.
area The amount of square units covered by a two dimensional figure.
hypotenuse The long side opposite the right angle in a right triangle.
perimeter The sum of the lengths of a closed plane figure.
circumference The distance around the circle.
radius A segment whose endpoints are the center of a circle and a point on the circumference of the circle.
diameter A segment that passes through the center of a circle and whose endpoints are on the circumference of the circle.
Pi The ratio of the circumference of the circle to the length of the diameter. π≈3.14π ≈ 3.14
proportion An equation that states two ratios are equivalent.
sector The part of a circle enclosed by two radii of a circle and their intercepted arc. (A pie-shaped part of a circle)
composed To create something.
decomposed To break something down into smaller parts or pieces.
breadth The distance from one side of an object to the other side.
composite figure A two dimensional geometric figure made from two or more two dimensional geometric figures.
semi-circle Half of a circle.
Created by: Mrs Ott