Area of a parallelogram. Definition and formula
Math Open Reference
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Definition of the midpoint of a line segment.
Math Open Reference
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Definition of locus - the shape formed by a set of points that satisfy given crtiteria
Math Open Reference
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Definition of a line segment, a line linking two points.
Math Open Reference
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Definition and properties of a linear pair of angles - two angles that are adjacent and supplementary
Math Open Reference
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An interactive applet that allows you to graphically see the effects of changing the coeeficients in a linear function using sliders
Math Open Reference
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Definition of a line
Math Open Reference
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Definition of the intersection of two lines
Math Open Reference
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Animation showing that in any triangle, the centroid, circumcenter and orthocenter are always collinear - they always lie on a straight line, called the Euler line.
Math Open Reference
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CPCTC - a way to remember 'Corresponding Parts of Congruent Triangles are Congruent'
Math Open Reference
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