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k guys need help and only have 40 min pls help. description of an undefined term? The distance along a line segment is the number of units between two points. Perpendicular lines are lines that intersect at a right angle. A ray extends infinitely in one direction from an endpoint. An angle is the figure formed by the intersection of two rays at a common endpoint. 2.Which mathematical term cannot be defined for all cases in a system of geometry? parallel lines midpoint of a line segment distance along an arc diameter of a circle

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