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Bell Work
• REMEMBER to take
GOOD/QUALITY notes while
looking at the power point slides
because you can use them on
the quiz!
11-2B Triangles
Vocabulary
• A triangle is a figure with three sides
and three angles. The symbol for
triangle is
.
Find a Missing Measure
Check Your Progress
Vocabulary
• Every triangle has at last two
acute angles. One way to
classify triangles is by using the
third angle.
• Another way to classify triangles
is by their sides. Sides with the
same length are congruent
segments.
11-2D
Quadrilaterals
Angles of a Quadrilateral
Find Angle Measures
Check Your Progress
• Find the value of x.
Classifying Quadrilaterals
Classifying Quadrilaterals
Find a Missing Measure
• What is the value of x in the parallelogram at
the right?
• Opposite angles of a
•
•
parallelogram are
congruent. So, x=70.
Check Your Progress
d. Find the measure in degrees of angle P
in the rhombus
e. Find the measure in degrees of angle Q
in the rhombus.
11-2E Polygons
and Angles
Vocabulary
• A polygon is a simple, closed figure
formed by three or more straight
line segments.
• A simple figure does not have lines
that cross each other.
• You have drawn a closed figured
when your pencil ends up where it
started.
Vocabulary
Vocabulary
• A polygon can by classified
by the number of sides it has.
Vocabulary
• An equilateral polygon has all
sides congruent.
• A polygon is equiangular if al of its
angles are congruent.
• A regular polygon is equilateral
and equiangular, with all sides and
all angles congruent.
Find the Sum of the Angles
of a Polygon
• Find the sum of the angle
measures of the polygon.
• Draw all of the diagonals from
one vertex as shown and count
the number of triangles formed.
• Find the sum of the measures in
the polygon.
Interior Angle Sum of a
Polygon
Angle Relationships Quiz
• Take out a sheet of paper
and write your heading.
• Please show all of your
work.
• You may use your notes,
but you may not talk to
one another.