isosceles triangle, scalene triangle, equilateral triangle, parallelogram, trapezoid, pentagon, decagon, heptagon, octagon, hexagon, nonagon, parallel lines, perpendicular lines, intersecting lines, rectangular prism, cuboid, sphere, pyramid, right triangle, obtuse triangle, acute triangle, straight angle, acute angle, right angle, obtuse angle, vertex, rhombus, ray, quadrilateral, line segment,

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