Concept explainers
(a)
To find: whether the statement is true or false.
(a)
Answer to Problem 4MRE
The given statement is true.
Explanation of Solution
Given:
The statement is given as “Two planes are parallel only if they do not intersect”.
Calculation:
Consider the statement.
Two planes are parallel only if they do not intersect.
A plane can be considered to be consisted of several parallel lines lying in the plane.
Figure 1
As it is clear from the figure that line A and Line B are parallel to each other, and they are not intersected.
Now, if the lines are not parallel, then they are going to intersect each other at some point.
That means, the two planes are parallel if they do not intersect each other.
Therefore, the given statement is true.
(b)
To find: the converse of the given statement.
(b)
Answer to Problem 4MRE
If two planes do not intersect, then they are parallel.
Explanation of Solution
Given:
The converse of the statement is “Two planes are parallel only if they do not intersect”.
Calculation:
Consider the statement.
“Two planes are parallel only if they do not intersect”.
Recall that the converse of a statement “if p, then q” is given as “if q, then p”.
So, the converse of the given statement is “If two planes do not intersect, then they are parallel”.
(c)
To find: whether the converse of the statement is true or false.
(c)
Answer to Problem 4MRE
The converse of the statement is true.
Explanation of Solution
Given:
The converse of the statement is “Two planes are parallel only if they do not intersect”.
Calculation:
Consider the statement.
“Two planes are parallel only if they do not intersect”.
The converse of the statement is,
“If two planes do not intersect, then they are parallel.”.
Consider that the two planes do not intersect. So, the
If planes are considered to be consisted of serval parallel lines, the angle between the lines of two planes will also be either 0 or 180 degrees.
That means, the lines of one plane are parallel to the lines of the other planes. This implies that the planes are parallel.
Therefore, if two planes do not intersect, they must be parallel.
Hence, the converse of the statement is true.
Chapter 3 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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