Download Triangles and Parallel Lines

Triangles Sum
Types of Triangles……
• Scalene Triangle:
• A triangle with no
2 sides of equal
length.
Angles of a Triangle……
• The sum of ALL 3
angles of a
triangle add up to
180 degrees!!!!!!!
• What is the
missing angle
measure?
Use the triangle shown
to answer the questions.
• Angle B is what
degree?
• Is it acute?
• Is it isosceles?
Example……
• What kind of
triangle is ABC if
mA  70  and
• First find mC.
mC  180  (70  10 )
mC  100
mB  10  ?
• Triangle ABC is an
obtuse triangle.
Example……
• What kind of
triangle is ABC if
mA  70 and
• First find mC.
mC  180  (70  60 )
mC  50
mB  60 ?
• Triangle ABC is an
acute triangle.
Find x
27
x
31
43

Find x
x
119
28
Assignment……
• Triangle Sum Worksheet