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Geometry Vocabulary Angle - A figure formed by two rays or line segments that meet at an endpoint Degree - A unit of measuring angles. Also a unit for measuring temperature. Acute Angle – An angle that measures less than 90⁰ Obtuse Angle – An angle that measures greater than 90⁰ Right Angle – An angle that measures exactly 90⁰ Polygon - A closed plane figure with sides made of straight line segments Acute triangle - A triangle with three acute angles Equilateral triangle - Having all equal sides and angles Obtuse triangle - A triangle with one obtuse angle Isosceles triangle - A triangle with at least two congruent sides Right triangle - A triangle with one right angle Scalene triangle - A triangle with no equal sides is a scalene triangle Parallel - Lines that extend in the same direction and will never meet or cross Perpendicular - Lines are considered to be perpendicular to each other if they form congruent adjacent angles that are 90° Vocabulary Word Definition angle A figure formed by two rays or line segments that meet at an endpoint degree A unit of measuring angles. Also a unit for measuring temperature. acute angle An angle that measures less than 90⁰ obtuse angle An angle that measures more than 90⁰ right angle An angle that measures exactly 90⁰ polygon A closed plane figure with sides made of straight line segments Vocabulary Word Definition acute triangle A triangle with three acute angles equilateral triangle Having all equal sides and angles obtuse triangle A triangle with one obtuse angle isosceles triangle A triangle with at least two congruent sides right triangle A triangle with one right angle scalene triangle A triangle with no equal sides is a scalene triangle parallel perpendicular Lines that extend in the same direction and will never meet or cross Lines are considered to be perpendicular to each other if they form congruent adjacent angles that are 90°