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"A point refers usually to an element of some set called a space. A line, strictly speaking, has no ends. A line is one-dimensional. It has zero width. A line segment is the part of a line that connects two points. It has definite end points. A ray starts at a given point and goes off in a certain direction forever, to infinity. An angle is the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet. Vertex typically means a corner or a point where lines meet. For any set of congruent geometric figures, corresponding sides, angles, faces, etc. are congruent. Parallel lines are two lines that are always the same distance apart and never touch. Perpendicular means "at right angles". Bisectors are the lines that divides something into two equal parts Distance formula is: sqrt of (x2-x1) squared minus (y2-y1) squared Midpoint formula is: If you need to find the point that is exactly halfway between two given points, just average the x-values and the y-values."
Whoa, I feel a little light headed.
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