Perpendicular, lines that intersect each other at a perfect right angle (90°), Parallelogram, a four-sided flat shape (quadrilateral) where both pairs of opposite sides are parallel, Kite, a four-sided flat shape where the four sides are grouped into two pairs of equal-length sides that are next to each other, Isosceles Trapezoid, a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides, Trapezoid, a four-sided flat shape where every corner is a right angle (90°)., Rectangle, a four-sided flat shape where every angle is a right angle (90 degrees)., Rhombus, a two-dimensional, flat geometric shape that has four equal-length sides, square, a flat, two-dimensional shape with four straight sides of equal length and four square corners (right angles)., Parallel, lines that run in the same direction and never intersect or touch, no matter how far they are extended, Segment, line segment is a part of a line that is bounded by two distinct endpoints., Ray, a part of a line that starts at one distinct endpoint and goes on forever in one direction., Line, a straight, one-dimensional path that has no thickness and extends infinitely in both opposite directions., point, an exact, precise location or position in space that has no size, width, length, or depth, Plane, a flat, two-dimensional surface that extends infinitely in all directions, Circle, a round flat shape made up of all the points in a plane that sit at an exact equal distance from a central point., Arc, any portion or segment of the curved edge (circumference) of a circle., Chord, a straight line segment whose endpoints both lie on the edge of a circle, Scalene, a triangle where all three sides have completely different lengths, Isosceles, a triangle that has at least two sides of equal length., Acute, an angle that measures strictly less than 90 degrees,, Obtuse, an angle that measures strictly greater than 90 degrees and less than 180 degrees, Straight, a straight angle is an angle that measures exactly 180 degrees., Supplementary, any two angles whose measures add up to a precise 180 degrees, Complementary, any two angles whose measures add up to a precise 90 degrees, Intersecting, those that cross paths and share at least one common point, Adjacent, adjacent angles are two angles that sit side-by-side, sharing a common vertex and a common side, Coordinate Plane, a flat, two-dimensional surface formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis., Origin, the exact central starting point of a coordinate plane, where the x-axis and y-axis cross each other., Regular Polygon, a two-dimensional closed shape with straight sides where all sides are equal in length and all interior angles are equal in measure, Perpendicular Bisector, a line, ray, or segment that cuts a line segment into two equal parts at a perfect 90-degree right angle

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