front 1 point | back 1 ![]() an exact position often marked as a dot |
front 2 line | back 2 ![]() a straight path of points that is endless in two directions |
front 3 line segment | back 3 ![]() a part of a line with two endpoints |
front 4 intersecting lines | back 4 ![]() lines that cross at one point |
front 5 parallel lines | back 5 ![]() lines that never cross |
front 6 ray | back 6 ![]() a part of a line that has one endpoint and continues endlessly in one direction |
front 7 angle | back 7 ![]() a figure formed by two rays that have the same endpoint. |
front 8 vertex plural: vertices | back 8 ![]() 1. the point where two rays met to form an angle.
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front 9 right angle | back 9 ![]() an angle that forms one square corner or 90 degree angle |
front 10 acute angle | back 10 ![]() an angle that's open end measures less than a right angle |
front 11 obtuse angle | back 11 ![]() an angle that's open measures more than a right angle |
front 12 perpendicular | back 12 ![]() two lines, line segments or rays that form right angles |
front 13 polygon | back 13 ![]() a closed figure made up of line segments |
front 14 side | back 14 ![]() a line segment forming part of a polygon |
front 15 triangle | back 15 ![]() a polygon with 3 sides and 3 vertices |
front 16 quadrilateral | back 16 ![]() a polygon with 4 sides and 4 vertices |
front 17 pentagon | back 17 ![]() a polygon with 5 sides and 5 vertices |
front 18 hexagon | back 18 ![]() a polygon with 6 sides and 6 vertices |
front 19 octagon | back 19 ![]() a polygon with 8 sides and 8 vertices |
front 20 decagon | back 20 ![]() a polygon with 10 sides and 10 vertices |
front 21 equilateral triangle | back 21 ![]() a triangle with all sides the same length |
front 22 isosceles triangle | back 22 ![]() a triangle with at least two sides the same length |
front 23 scalene triangle | back 23 ![]() a triangle with no sides the same length |
front 24 right triangle | back 24 ![]() a triangle with one right angle |
front 25 acute triangle | back 25 ![]() a triangle with 3 acute angles |
front 26 obtuse triangle | back 26 a triangle with one obtuse angle |
front 27 trapezoid | back 27 ![]() a quadrilateral with only one pair of parallel sides |
front 28 parallelogram | back 28 ![]() a quadrilateral in which opposite sides are parallel |
front 29 rectangle | back 29 ![]() a quadrilateral with four right angles. It is a special parallelogram |
front 30 rhombus | back 30 ![]() a quadrilateral with opposite sides parallel and all sides the same length. Opposite angles are obtuse and the other opposite angles are acute. It is a special parallelogram |
front 31 square | back 31 ![]() a quadrilateral with 4 right angles and all sides the same length. it is a special parallelogram and a combination of a rectangle and rhombus |
front 32 diagonal | back 32 ![]() a line segment other that a side that connects two vertices of a polygon |