Download 4.1: Apply Triangle Sum Properties

4.1: Apply Triangle Sum Properties
Triangle: A polygon with 3 sides.
D
F
E
Naming triangles:
· use the word triangle or the symbol for a triangle
followed by the three vertices
ex.
triangle DEF or
DEF
,
Triangle Sum Theorem:
The sum of the measures of
the interior angles of a triangle
is 180 degrees.
Exterior Angle Theorem:
The measure of an exterior angle
of a triangle is equal to the sum
of the measures of the two
nonadjacent interior angles.
4.1: Apply Triangle Sum Properties
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Learning Targets:
- I can classify triangles by their angle
measures or side lengths
- I can find missing interior and exterior
angles of triangles
*
Homework:
p.221 #1-37, 42-47
Challenge: 39, 41, 48, 50, 52
4.2: Apply Congruence and Triangles
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Learning Targets:
- I can determine if two figures are conguent
and write congruence statements for them
- I can find missing angles using the
congruence theorems
*
Homework:
p.228 #1-26
4.2: Apply Congruence and Triangles
Vocabulary:
· Congruent figures: Figures that are exactly the same shape
and size
Give two more congruence
statements for the triangles above.
Find m∠DCN
D
B
45°
N
30°
A
C