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McGraw Hill Glencoe Geometry, 2012 View details

1. Points, Lines, and Planes

Finish the assignment

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Exercise 25 Page 9

What are the properties of lines and planes?

Two planes intersecting in a line

Practice makes perfect

Let's recall what a line is and what a plane is.

A plane is a flat surface made up of points. Both swinging doors are part of planes.
A line is a collection of points. The bar around which the doors swing is the intersection line of the two planes.