
To find: the first sentence of an indirect proof of the given statement.

Answer to Problem 3CE
The first sentence to be used to write this proof is:
Assume that D is not a Canadian.
Explanation of Solution
Given information:
D is a Canadian.
Calculation:
Consider the following statement:
Dough is a Canadian.
Write out the first sentence of an indirect proof of this statement.
Start of an indirect proof by assuming temporarily that the given conclusion is not true.
Hence, in this case, the first sentence to be used to write this proof is:
Assume that D is not a Canadian.
Chapter 6 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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