Cornell Notes Template Geometry 1 Unit 2: Reasoning And Proof Page 3
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16Counterexample
An example that proves that a given statement is _____________
If x + 1 = 0, then x = -1
Example 3
Determine if the
following statements
If a polygon has six sides, then it is a decagon.
are true or false.
If false, give a
counterexample.
If the angles are a linear pair, then the sum of the measure of the angles is
90º.
In most cases, you can form the negation of a statement by either adding or
Negation
deleting the word “ _______.”
Negation:
m A = 30°
Mr. Ross is not more than 6 feet tall.
Examples of
Negation:
Negations
I am doing my homework.
Negation:
Stanfield is the largest city in Arizona.
All triangles have three sides.
Example 4
Write the negation of
Dairy cows are not purple.
each statement.
Determine whether
your new statement
is true or false.
Some VGHS students have brown hair.
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