Points, Lines, and Angles
Presentation
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Mathematics
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9th - 12th Grade
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Practice Problem
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Medium
Standards-aligned
Ashley Ramsell
Used 25+ times
FREE Resource
12 Slides • 9 Questions
1
Points, Lines, and Angles
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Points and Planes
A point is a single location in a space. We assign a name to a point by writing a letter next to it. A plane is a collection of points that extends to form a flat surface.
In the drawing, point A lies on plane P.
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Lines
Much of your work in geometry will be concerned with lines and angles. A line is a straight pathway of points that extend indefinitely in two directions. A line may be named by a single letter or by two points on the line.
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Rays and Line segments
A ray is a part of a line that begins at an endpoint and extends indefinitely in one direction. A portion of a line with two endpoints is called a line segment. Both rays and line segments are named using two points.
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Angles
When two rays share an endpoint, they form an angle. The shared endpoint is the vertex of an angle. An angle can be named in different ways: by a number written in degrees inside the angle, by the vertex, or by the points on the angle.
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Right Angles
This angle measures 90 degrees
Can be identified by a small square inside the angle.
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Acute Angles
These angles measure LESS than 90 degrees
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Obtuse Angles
These angles measure MORE than 90 degrees
But LESS than 180 degrees
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Straight Angles
These angles measure exactly 180 degrees
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Reflex Angle
This angle measure MORE than 180 degrees
But LESS than 360 degrees
Remember: This is not an upside-down obtuse angle. Look for the angle indicator.
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Complimentary, Supplementary, and Conjugate Angles
Complimentary: When two angles = 90 degrees
Supplementary: When two angles = 180 degrees
Conjugate: When two angles = 360 degrees
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Multiple Choice
<QZR is a straight angle. What is the measure of <QZS?
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Multiple Choice
What kind of angle is <SZT?
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Multiple Choice
<AWD is a straight angle. What is the measure of <BWC?
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Multiple Choice
What kind of angle is <AWC?
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Points, Lines, and Angles
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