Download Measuring Angles and Segments

Mind on Math
• Complete the “Work
Together” with a
partner.
Good Definitions
Geometry
Mr. Zampetti
Unit 1, Day 7
Properties of Good Definitions
• Uses clearly understood terms.
Bad Example:
Widget: A thingamabob
with 2 extending
whosamagigs.
Properties of Good Definitions
• Uses clearly understood terms.
• Precise. Avoids words such as “large,”
“sort of,” and “some”.
Bad Example:
• Carp: A big fish.
Properties of Good Definitions
• Uses clearly understood terms.
• Precise. Avoids words such as “large,”
“sort of,” and “some”.
• States what the term IS, not what the term
IS NOT.
Bad Example:
Big: the opposite of
small.
Properties of Good Definitions
• Uses clearly understood terms.
• Precise. Avoids words such as “large,”
“sort of,” and “some”.
• States what the term IS, not what the term
IS NOT.
• Is reversible.
Great Example:
Right angle: an angle
that measures 90º.
Also, an angle that
measures 90º is a right
angle.
Definition
Midpoint: the point that
divides a line segment
into two congruent
segments.
Definition
Segment Bisector: a
segment, line, or ray
that divides a line
segment into two
congruent segments.
Definition
Perpendicular Lines:
two lines that intersect
to form right angles.
()
Definition
Perpendicular Bisector
of a segment: a line,
segment or ray that is
perpendicular to a
segment at its
midpoint.
Definition
Angle Bisector: a ray
that divides an angle
into two congruent
angles.
Practice
Practice
Homework
Homework Packet:
Good Definitions.