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### 18 Cards in this Set

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• Back
 Protractor am instrument used to measure the size of an angle Degree a unit of measure for angles acute angle angle measuring less that 90* right angle angle measuring more that 90* obtuse angle measures greater than 90* and less than 180* straight angle measures 180* polygon a plane closed figure formed by a line segment line segment a part of a line that has two points equallateral triangle a triangle with all sides the same length isoceles triangle a triangle with two side the same length right triangle triangle with one right angle obtuse triangle triangle with one angle greater that 90* quadrilateral a polygon with four sides square polygon with four equal sides rectangle opposite sides are parallel and the same length and had four right angles parallelagram two pairs of parellel sides rhombus two pairs of parallel sides all sides are the same length trapezoid only one pair of parallel sides