Definition and properties of a cube. 	   
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												Finding the midpoint of a line segment given the coordinates of the endpoints 	   
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												Definition of 'Angle Bisector' and a general discussion of bisection.  Link to 'line bisector' 	   
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												Definition of collinear points -  three or more points that lie in a straight line 	   
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												Definition of a transversal. A line that cuts across two or more (usually parallel) lines. Also perpendicular transversal 	   
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												The Protractor described.  Dual scales, baseline and origin. 	   
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												A problem involving the calculation of spacecraft orbits. 	   
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												Definition of a point 	   
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												Perpendicular definition:  Perpendicular simply means 'at right angles'. A line is perpendicular to another if they meet at 90 degrees.  	   
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												Area of a parallelogram. Definition and formula 	   
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