Exploring Geometry Vocabulary: Points, Lines, and Planes

This video tutorial covers the basic vocabulary of geometry, focusing on points, lines, planes, line segments, rays, and their properties. It explains how to name these geometric elements and discusses concepts like collinear and coplanar points. The tutorial also explores intersections and provides practical examples to help understand these geometric principles.

What is a point?

• A location with no shape or size

• A location with shape and size

• A flat surface with three points

• A line with two endpoints

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How is a line named?

• By a single uppercase letter

• By three points on the line

• By two points on the line with a line symbol on top

• By a single lowercase letter

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CCSS.HSG.CO.A.1

What is a plane?

• A location with no shape or size

• A line with two endpoints

• A flat surface made of at least three points that goes on forever in all directions

• A line that goes on forever in one direction

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How can a plane be named?

• By two points on the plane

• By a single lowercase letter

• By a single number

• By three points on the plane or a single uppercase cursive letter

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What is a line segment?

• A location with no shape or size

• A flat surface made of at least three points

• A line that goes on forever in one direction

• A part of a line with two endpoints

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CCSS.HSG.CO.A.1

How is a ray named?

• By a single uppercase letter

• By three points on the ray

• By the endpoint first and then the other point with a ray symbol on top

• By two points on the ray with a line symbol on top

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What are opposite rays?

• Two rays that form a line segment

• Two rays that go in opposite directions from each other starting at the same endpoint

• Two rays that form a plane

• Two rays that go in the same direction from each other

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What are collinear points?

• Three or more points that do not lie on the same line

• Two points that form a line

• Three or more points that lie on the same plane

• Three or more points that lie on the same line

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What are coplanar points?

• Three or more points that lie on the same plane

• Three or more points that lie on the same line

• Three or more points that do not lie on the same plane

• Two points that form a line

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CCSS.HSG.CO.A.1

How do two planes intersect?

• They do not intersect

• At a point

• At a line

• At a curve

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CCSS.4.G.A.1