Two lines crossing at 90 degree angles - Perpendicular, Two lines never crossing - Parallel , An angle with a measure of 90 degrees - Right Angle, Triangle with all equal sides and angles - Equilateral Triangle, Triangle with no equal sides or angles - Scalene Triangle, Triangle with two congruent sides and angles - Isosceles Triangle, Triangle whose angles are less than 90 degrees - Acute Triangle, Triangle with one angle equal to 90 degrees - Right Triangle, Triangle with one angle greater than 90 degrees - Obtuse Triangle, A polygon with 4 sides - Quadrilateral, A polygon with 5 sides - Pentagon, A polygon with 6 sides - Hexagon, A polygon with 7 sides - Heptagon, A polygon with 8 sides - Octagon, A polygon with 9 sides - Nonagon, A polygon with 10 sides - Decagon, A pair of angles whose sum is 180 degrees - Supplementary , A pair of angles whose sum is 90 degrees - Complementary, Two opposite and congruent angles formed by the intersection of two lines - Vertical angles , Angles that share a common side and a common vertex - Adjacent angles, A pair of angles inside two lines but on opposite sides of the transversal - Alternate Interior angles, A pair of angles outside two lines but on opposite sides of the transversal - Alternate Exterior angles, A pair of angles in the same location at different intersections - Corresponding angles, A pair of angles inside two lines and on the same side of the transversal - Consecutive Interior angles, One endpoint and extends to infinity in one direction - Ray , No endpoints and extends to infinity in both directions - Line, Two endpoints and does not extend to infinity - Line Segment, A precise location - Point, The longest chord of a circle that passes through the center point - Diameter, The line segment formed from the center of the circle out to the edge - Radius, Similar to the perimeter of a polygon - Circumference, An angle formed by two radii at the center of the circle - Central Angle, An angle formed by two chords of a circle  - Inscribed Angle, A part of the curve of a circle - Arc, The height - Altitude, Line segment whose endpoints both lie on the circle - Chord, Equal or the same - Congruent, A line segment that extends from the vertex of a triangle to the midpoint of the opposite side - Median, The halfway point between two endpoints - Midpoint, Opposite/Hypotenuse - Sine, Adjacent/Hypotenuse - Cosine, Opposite/Adjacent - Tangent, To change a geometric figure in size or shape - Transformation, To turn a figure - Rotation, To slide a figure - Translation, To flip a figure - Reflection, A line that cuts through two or more lines - Transversal, The sum of the areas of the faces of a 3D object - Surface Area, The number of unit cubes enclosed in a 3D object - Volume, A 3D shape with no vertices, no faces, and no edges - Sphere, A 3D shape with two polygonal bases and rectangular faces - Prism, A 3D shape with one vertex, a polygonal base, and triangular faces - Pyramid, A 3D shape with one vertex and one circular base - Cone, A 3D shape with two circular bases and no vertices - Cylinder, The number of unit squares enclosed in a 2D shape - Area, Corners - Vertex, A transformation that does not change the size of a figure - Isometry, The flat surface of a 3D object - Face , Line segments that join two vertices - Edge,

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