front 1 Point | back 1 An exact location in space, usually represented by a dot |
front 2 Angle | back 2 A figure formed by two rays that have a common endpoint |
front 3 Vertex | back 3 The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone; the plural of vertex is vertices |
front 4 Circle | back 4 A closed plane figure with all points on the figure the same distance from the center |
front 5 Radius | back 5 A line segment with one endpoint at the center of a circle and the other endpoint on the circle |
front 6 Obtuse Triangle | back 6 A triangle that has one obtuse angle |
front 7 Polygon | back 7 A closed plane figure formed by three or more line segments |
front 8 Square | back 8 A rectangle with 4 equal sides |
front 9 Pentagon | back 9 A polygon with five sides |
front 10 Line | back 10 A straight path in a plane that goes on forever in opposite directions |
front 11 Right Angle | back 11 An angle formed by perpendicular lines, line segments, or rays and with a measure of 90° |
front 12 Parallel Line | back 12 Lines in a plane that never intersect |
front 13 Circumference | back 13 The distance around a circle |
front 14 Triangle | back 14 A polygon with three sides |
front 15 Equilateral Triangle | back 15 A triangle with three congruent sides |
front 16 Parallelogram | back 16 A quadrilateral whose opposite sides are parallel and congruent |
front 17 Trapezoid | back 17 A quadrilateral with one pair of parallel sides |
front 18 Closed Figure | back 18 A figure that begins and ends at the same point |
front 19 Line Segment | back 19 A part of a line that includes two points, called endpoints, and all of the points |
front 20 Acute Angle | back 20 An angle that has a measure less than a right angle (less than 90°) |
front 21 Perpendicular Lines | back 21 Two lines that intersect to form four right angles |
front 22 Chord | back 22 A line segment with its endpoints on a circle |
front 23 Right Triangle | back 23 A triangle with one right angle |
front 24 Isosceles Triangle | back 24 A triangle with two congruent sides |
front 25 Quadrilateral | back 25 A polygon with four sides |
front 26 Hexagon | back 26 A polygon with six sides and six angles |
front 27 Ray | back 27 A part of a line, with one endpoint, that continues without end in one direction |
front 28 Obtuse Angle | back 28 An angle whose measure is greater than 90° and less than 180° |
front 29 Intersecting Lines | back 29 Lines that cross at exactly one point |
front 30 Diameter | back 30 A line segment that passes through the center of
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front 31 Acute Triangle | back 31 A triangle in which all three angles are acute |
front 32 Scalene Triangle | back 32 A triangle with no congruent sides |
front 33 Rectangle | back 33 A parallelogram with four right angles |
front 34 Octagon | back 34 A polygon with eight sides |