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parallel
Two lines that don't intersect are called parallel. We can also call segments parallel if they extend into parallel lines.
parallelogram
A quadrilateral in which pairs of opposite sides are parallel.
Parallel Postulate
The Parallel Postulate says that given a line and a point and only one line through that is paralell to .
perpendicular
not on the line, there is one
Two lines are perpendicular to each other if they intersection at right angles.
perpendicular bisector
The perpendicular bisector of a segment is a line through the midpoint of the segment that is perpendicular to it.
point-slope form
The form of an equation for a line with slope through the point .
pre-image
If a rigid transformation takes to , then is the pre-image and is the image.
probability
The probability of a chance event is a number between 0 and 1 that expresses the likelihood of the event occurring, with 0 meaning it will never occur and 1 meaning it will always occur.
radian
To Rnd the radian measure of an angle, create a circle of any size centered at the vertex of the angle. The angle traces out an arc of the circle. The radian measure of the angle is the ratio of arc length to radius.
rectangle
A quadrilateral with four right angles.
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