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Session 55. Draw six segments that pass through every dot in the figure without taking your pencil off the paper. Go over test. Unit 5 Vocabulary. Angle . A figure formed by 2 rays with a common endpoint. The angle is . Circle .

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## Session 55

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**Session 55**Draw six segments that pass through every dot in the figure without taking your pencil off the paper.**Angle**• A figure formed by 2 rays with a common endpoint. The angle is**Circle**• The set of points on a plane at a certain distance, or radius, from a single point, the center**Perpendicular Line**Two lines that intersect at a right angle (90°). Written as**Parallel Line**Lines in a plane that either do not share any points and never intersect, or share all points. Written as**Line Segment**A line with two endpoints. Written as**Point**An exact position or location in a given plane. Point A or Point B**Line**The set of points between points P and Q in a plane and the infinite number of points that continue beyond the points. Written as**Distance along a line**The linear distance between two points on a given line.**Right Angle**An angle that measures 90°.**Acute Angle**An angle measuring less than 90° but greater than 0°.**Obtuse Angle**An angle measuring greater than 90° but less than 180°.**One-to-One**A relationship wherein each point in a set of points is mapped to exactly one other point.**Pre-image**The original figure before undergoing a transformation.**Image**The new, resulting figure after a transformation**Isometry**A transformation in which the preimage and image are congruent.**Transformations are called RIGID if every image is congruent**to its preimage. Rigid transformations can also be referred to as an ISOMETRY. Every segment is congruent to its image.**Which of the following are rigid transformations? (Isometry)****Isometries not onlypreserve lengths, butthey preserve angle**measuresparallel lines, andbetweenness of points**Find the value of each variable, given that the**transformation is an isometry.**Congruent**Figures are congruent if they have the same shape, size, lines, and angles.**Similar Triangles**Triangles are similar if they have the same shape but have different sizes.

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