
Concept explainers
To describe: The number of lines that can be drawn through the vertex of a

Answer to Problem 17CE
In the plane of points P , Q , and R , through a point R exactly one line can be drawn perpendicular to
Explanation of Solution
Given information:
The lines drawn through point R in the plane of points P , Q , and R are perpendicular to side
shown in Figure-1.
Theorem used:
Through a point outside a line, there is exactly one line perpendicular to the given line.
According to the theorem stated above, through the point R on the line
exactly one line
say) can be drawn perpendicular to
Another explanation: Suppose line is a line through R perpendicular to
Figure-2). If another line
is drawn through R that will make some
with line
in that case
will not be perpendicular to
Thus, through a point R on the line
there is exactly one line perpendicular to
from a point not on the line
.
The theorem that justify the answer is stated as:
Through a point outside a line, there is exactly one line perpendicular to the given line.
Conclusion:
In the plane of points P , Q , and R , through a point R exactly one line can be drawn perpendicular to
Chapter 3 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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