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This Concept Map, created with IHMC CmapTools, has information related to: 2 Dimensional figures-Draft 1, number of sides made of 10 sides decagon, angle measurement < 90 degrees acute, angle measurement > 180 degrees reflex, right triangle considered irregular, regular have the same size angles, number of sides made of 4 sides quadrilaterals, 2-dimensional figures can be closed, angle measurement = 90 degrees right, angles classified by angle measurement, angles named right, rectangle considered irregular, rays which have a beginning but no end, line segments which have a beginning and end point, 2-dimensional figures can be open, number of sides made of 9 sides nonagon, closed includes circles, triangles has one right angle right triangle, angles made from rays, quadrilaterals with 2 pairs of parallel sides parallelogram, quadrilaterals with 1 pair of parallel sides trapezoid