Transcript 3.5 – Triangle Sum Theorem

Please get the warm up off the
back table
10f
a
3r
3d
2a - 1
4mp
3b
12p - 3q
-4c + 4
r
2q + 5
x – 3t
3f + 10g
f – 5h
3r – 2s + 4
x-y
BC = 8.5
AC = 8
x = 10
x = 10
x=6
x=8
BC = 25
x = 13
Just for fun…
do these
(on the back of your warm up)
1.
1 2 3
2.
4
5
3.
Name 2 pair of alternate interior angles
<5 & <3
and
<4 & <1
What is the sum of m<1 + m<2 + m<3?
180°
If m<4 = 65° and m<5 = 50°, what is m<2?
65°
90°
50°
130°
50°
40°
40° 50°
90°
40°
4.
Find all the angle measures
Flashcards
Pick a partner
Get a set of flashcards
Work on identifying angles
You will have 10 minutes
Go
Just a little quickie…
♥ Please get pg 173 off the back desk and
do problems 5-20….
♥ We’re just getting a head start on today’s
assignment…
♥ We’ll have notes in 15 minutes…
♥ Go
Triangle Sum Theorem
&
Exterior Angle Theorem
Triangle Sum Theorem
The sum of the angle measures in a triangle
equal 180°
1
3
2
m<1 + m<2 + m<3 = 180°
Exterior Angle Theorem
(your new best friend)
The measure of an exterior angle in a
triangle is the sum of the measures of
the 2 remote interior angles
remote
interior
angles
exterior
angle
2
1
3
m<4 = m<1 + m<2
4
an example with numbers
find x & y
82°
x = 68°
30°
x
y
30x
40x
y = 112°
find all the angle measures
10x2
80°, 60°, 40°
Do you hear the
sirens?????
White boards
Please get, or have someone get for you;
whiteboard
marker
eraser
Finish
the
assignment
On the same paper as 5-20,
Please do 21-37 on page 174