a continuous length - line, a part of a line with two end points - segment, a part of a line with a starting point, but no ending point - Ray, a triangle with one internal angle equal to 90 degrees - right angle, an angle less than 90 degrees but greater than 0 degrees - acute angle, an angle greater than 90 degrees but less than 180 degrees - obtuse angle, a triangle with all sides equal and all angles equal - equilateral triangle, a triangle having three unequal sides and angles - scalene triangle, a triangle which has two sides equal - isosceles triangle, two line segments which cross to form 90 degree angles - perpendicular lines, line segments that cross each other - intersecting lines, a polygon with four sides - quadrilateral, both pairs of opposite sides parallel to each other - parallelogram, a quadrilateral figure having two parallel and two nonparallel sides - trapezoid, an equilateral parallelogram having slanted sides - rhombus, a parallelogram having four right angles - rectangular, a rectangle having all four sides of equal length - square, when a shape is the same on both sides if divided - symmetry, rotating in the same way a clock does - clockwise, rotating in the opposite way of a clock - counterclockwise, The unit of measurement for an angle in mathematics is called a degree. - degree,

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