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**3.**a geometric element that has position but no extension**5.**an ___ is formed by two rays that begin or end at the same point, and is measured in degrees**6.**A quadrilateral having both pairs of opposite sides parallel to each othe**9.**a pair of lines that never intersect**10.**two objects are _____ if they have same shape and dimensions**14.**a geometric term for "cut in half"**17.**a 3 sided polygon**18.**The line segment between two points on a given curve.**19.**area of a triangle is 1/2 * ___* height**20.**the point of intersection of lines or geometric shapes

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**1.**an angle less than 90 degree**2.**two shapes are _____if their only differnce is size**4.**a measure for angles**7.**a triangle with all equal sides**8.**a collection of points which are equidistant from one common point called the center**11.**A part of a line starting at a particular point and extending infinitely in one direction.**12.**triangles in with each side is a different length**13.**a ____ angle is n angle of 90 degree**15.**closed segment of a differentiable curve in the two-dimensional plane**16.**a flat surface on which a straight line joining any two points on it would wholly lie.