Chapter 1: Q9 (page 7)
Can a given point be in two lines? In ten lines?
Short Answer
A point can be present in two, ten, or more lines.
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Chapter 1: Q9 (page 7)
Can a given point be in two lines? In ten lines?
A point can be present in two, ten, or more lines.
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For the following figure, name three angles that have B as the vertex.

Name a point on that is not on .

In Exercises 5-11 you will have to visualize certain lines and planes not shown in the diagram of the box. When you name a plane, name it by using four points, no three of which are collinear.

Write the postulate that assures you that exists.
You can think of the ceiling and floor or a room as parts of horizontal planes. The walls are parts of vertical planes. Vertical planes are represented by figures like those shown in which two sides are vertical. A horizontal plane is represented by a figure like that shown, with two sides horizontal and no sides vertical.

Can two horizontal planes intersect?
Sketch and label the figures described. Use dashes for hidden parts.
A vertical plane intersects two horizontal planes in lines I and n.
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