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### 21 Cards in this Set

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• Back
 acute angle an angle whose measure is more than 0 and less than 90. angle The opening that is formed when two lines intersect. congruent same size and shape. obtuse angle an angle that is more than 90 and less tha 180. plane flat surface with no boundaries polygon a closed flat shape quadrilateral four sided polygon right angle angle with square corner ar 90. side a segment of a poygon similar same shape but not size straight angle angle at 180 vertex a point of an angle, polygon, or solid exact number a number not rounded round to express a calculation round number a number that ends with zero acute triangle triangle that is less than 90 equilateral triangle a triangle with sides the same length isosceles triangle triangle with two sides the same length obtuse triangle a triangle whose largest angle measures more than 90 less than 180. right triangle a triangle that measures highest 90 scalene triangle triangle with sides of different lengths