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Geometry Cheat Sheet Parallel lines never touch ( = ) Perpendicular lines form a right angle ( + ) Intersecting lines cross each other ( x ) Symmetry means that you can fold it in half and both halves would be the same <> and { } are symmetrical Obtuse angles are larger than 90 degrees __/ Acute angles are smaller than 90 degrees < Right angles are 90 degrees L Scalene triangles have NO equal sides Isosceles triangles have 2 equal sides Equilateral triangles have all equal sides Lines go on forever both directions ←→ Line segments stops at both ends (a part of a line) ------ Rays start at a point and go on forever in only one direction ---> Angles have a vertex < Points are like a dot .
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