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### 33 Cards in this Set

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• Back
 PARALLELOGRAM A quadrilateral with 2 pair of parallel sides. RHOMBUS A parallelogram with all sides congruent. RECTANGLE A parallelogram with 4 congruent (90 degree) angles. HEPTAGON A polygon with 7 sides. SQUARE A parallelogram with all sides and all angles congruent. It is both a rectangle and a rhombus. OCTAGON A polygon with 8 sides. TRAPEZOID A quadrilateral with one pair of parallel sides. ISOSCELES TRAPEZOID A trapezoid with one pair of congruent sides. POLYGON A closed figure with straight sides. AREA OF A TRIANGLE One-half of base times height A = (bh)/2 TRIANGLE A 3 sided polygon. OBTUSE ANGLE An angle greater than 90 degrees and less than 180 degrees. VERTICAL ANGLES Two angles which share a common vertex and are opposite each other. Vertical angles are congruent. RIGHT ANGLE An angle of 90 degrees SUPPLEMENTARY ANGLES Two angles whose measures sum to 180 degrees. ACUTE ANGLE An angle of less than 90 degrees COMPLEMENTARY ANGLES Two angles whose measures sum to 90 degrees. REFLEX ANGLE An angle greater than 180 degrees and less than 360 degrees. STRAIGHT ANGLE An angle of 180 degrees. RIGHT TRIANGLE A triangle with one 90 degree angle. DECAGON A polygon with 10 sides. NONAGON A polygon with 9 sides. TOTAL NUMBER OF DEGREES IN A POLYGON. Number of degrees = 180 times the number of sides minus 2. d = 180(s-2) PENTAGON A polygon with 5 sides. ISOSCELES TRIANGLE A triangle with at least two congruent sides. SCALENE TRIANGLE A triangle with no congruent sides or angles. OBTUSE TRIANGLE A triangle with one angle greater than 90 degrees. ACUTE TRIANGLE A triangle with all angles less than 90 degrees. EQUILATERAL TRIANGLE A triangle with all sides and all angles congruent. QUADRILATERAL A 4 sided polygon. HEXAGON A polygon with 6 sides. KITE A quadrilateral with two pair of congruent sides and no sides parallel. DODECAGON A polygon with 12 sides.