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By Mr. Dunfee
Be sure to take these
notes, or you will not
be able to work at the
computer.
THE SUM OF THE ANGLES OF A
TRIANGLE IS 180 DEGREES.
Classifying triangles according to the measure
of the angles of the triangle.
All 3 angles measure less
than 90 degrees.
One angle measures 90
degrees and the other two
angles are acute.
One angle that measures
more than 90 degrees and
the other two are acute.
Classifying triangle according to the length
of the sides of the triangles.
The lengths of the sides
are not congruent. The
lengths are not equal in
size.
The lengths of two sides
are congruent.
The lengths of all three
sides are equal in size
which means they are
congruent.
Review
Classified by angles:
Acute, obtuse, right
Classified by sides:
Isosceles, scalene, equilateral
Congruent triangles are triangles that are
equal in size and shape. They have the same
length of the sides and have the same
measure of the angles.
Side Angle Side
Side Side Side
Angle Side Angle
Polygons
A polygon is a many
sided closed figure.
POLYGONS
Triangle-3 sided
Quadrilateral-4 sided
Pentagon-5 sided
Hexagon-6 sided
Polygons
Heptagon--7sided
Octagon--8 sided
Nonagon--9 sided
Decagon--10 sided
Undecagon--11 sided
Dodecagon--12 sided
**A regular polygon
has equal sides.**
(also called equilateral)
SQUARE
ALL SIDES ARE CONGRUENT
OPPOSITE SIDES ARE
PARALLEL. 4 RIGHT ANGLES
OPPOSITE SIDES
ARE CONGRUENT
AND PARALLEL.
4 RIGHT ANGLES.
OPPOSITE SIDES ARE
CONGRUENT AND
PARALLEL
OPPOSITE SIDES
ARE PARALLEL.
ALL SIDES ARE
CONGRUENT.
Has 2 parallel
lines.