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## Section 2-2 (cont.) Definitions

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### If it is a vehicle that flies, then it is an airplane. True False counterexample: helicopter * * Title: Section 2-2 (cont.) Definitions Author: DPS Last modified by: – PowerPoint PPT presentation

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Title: Section 2-2 (cont.) Definitions

1
Section 2-2 (cont.) Definitions
2
Definition Activity
• Work with your surrounding classmates and write
the definition for a Polyglob.

3
Good Definitions
• A good definition uses clearly understood terms.
The terms should be commonly understood or
• A good definition is precise. Good definitions
avoid words such as large, sort of, and almost.
• A good definition is reversible. That means that
you can write a good definition as a true
biconditional.

4
Example (Me)
• Show that this definition of perpendicular lines
is reversible. Then write it as a true
biconditional.
• Definition Perpendicular lines are two line that
intersect to form right angles.
• Conditional If two lines are perpendicular, then
they intersect to form right angles.
• Converse If two lines intersect to form right
angles, then they are perpendicular.
• Biconditional Two lines are perpendicular if and
only if they intersect to form right angles.

5
Example (We)
• Definition An airplane is a vehicle that flies.
• Conditional
• Converse

If it is an airplane, it is a vehicle that flies.
True
If it is a vehicle that flies, then it is an
airplane.
False counterexample helicopter
6
Example (You)
• Definition A right angle is an angle whose
measure is 90.
• Conditional
• Converse
• Biconditional

7
Homework Section 2-2 p.90 s 18-23, 33-37