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Draw six segments that pass through every dot in the figure without taking your pencil off the paper. Session 55
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Draw six segments that pass through every dot in the figure without taking your pencil off the paper.
Session 55
Go over test
Unit 5 Vocabular
y
Angle
• A figure formed by 2 rays with a common endpoint.
The angle is
ABC
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 AB PQ
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Parallel Line
Lines in a plane that either do not share any points and never intersect, or share all points.Written as AB PQ
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Line Segment
A line with two endpoints.Written as
AB
Point
Point A or
Point B
An exact position or location in a given plane.
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 #$$$$$$$$$$$$$ $
AB
Distance along a line
The linear distance between two points on a given line.
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.
Rigid transformations can also be referred to as an ISOMETRY.
Every segment is congruent to its image.
Transformations are called RIGID if every image is congruent to its preimage.
Which of the following are rigid transformations?
(Isometry)
Isometries not onlypreserve lengths, butthey preserve angle
measuresparallel lines, and
betweenness of points
Find the value of each variable, given that the transformation is an isometry.
72x6 23 y10
4 ,12 yx
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.
HWPractice WS
