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A is for Angle • An angle is two rays sharing a common end point B is for Base • The bottom of a geometric figure, note both the bottom and top of the figure are the base C is for Cube • A regular polyhedron for which all faces are squares D is for Diameter • A line segment between two points on the circle or sphere which passes through the center. The word diameter is also also refers to the length of this line segment E is for Equilateral Triangle • A triangle with three congruent sides F is for Formula • An expression used to calculate a desired result, such as a formula to find volume or a formula to count combinations. Formulas can also beequations involving numbers and/or variables, such as Euler's formula G is for Geometry • The study of geometric figures in two dimensions (plane geometry) and three dimensions (solid geometry). It includes the study of points, lines,triangles, quadrilaterals, other polygons, circles, spheres, prisms, p yramids, cones, cylinders, and polyhedra. Geometry typically includes the study of axioms, theorems, and two-column proofs H is for Heptagon • A polygon with seven sides. Some authors also use the name septagon instead of heptagon I is for Isosceles • A triangle with two sides that are the same length. Formally, an isosceles triangle is a triangle with at least two congruent sides. J is for AdJacent • Two angles in a plane which share a common vertex and a common side but do not overlap. Angles 1 and 2 below are adjacent angles K is for sKew • Lines in three dimensional space that do not intersect and are not parallel. • L is for Line • The geometric figure formed by two points. A line is the straight path connecting two points and extending beyond the points in both directions. M is for Measurement • The process of assigning a number to a physical property. Examples of measurement include length, size of an angle, area, volume, mass, time, etc. N is for Numbers • a numeral or group of numerals. • the sum, total, count, or aggregate of a coll ection of units 5-a number O is for Obtuse Angle • An angle that has measure more than 90° and less than 180°. P is for Parallelogram • A quadrilateral with two pairs of parallel sides. • Q is for Quadrilateral • A polygon with four sides. R is for Right Angle • A 90° angle. • S is for Sphere • A three dimensional solid consisting of all points equidistant from a given point. This point is the center of the sphere. Note: All cross-sections of a sphere are circles. • T is for Trapezoid • US usage, definition 1: A quadrilateral which has a pair of opposite sides which are parallel. The parallel sides are called the bases, and the other two sides are called the legs. • U is for Unit of Measurement • any division of quantity accepted as a standard of measurement or exchange ‘Pounds , and Ounces are units of measurment V is for Vertices • • The highest point; the top or apex. W is for Width • The measurement or extent of something from side to side X is for X-Axis • the horizontal axis in a plane coordinate system. Y is for Y-Axis • the horizontal axis in a plane coordinate system. Z is for Z-Axis • the horizontal axis in a plane coordinate system. All definitions credit to All definitions credit to www.mathwords.com www.mathwords.com