Find the missing side'

1

• Find the missing side.
• 3
• Are these triangles obtuse, acute, right, or
  impossible?
• a. 6, 11, 8 b. 2, 12, 10 c. 5, 12, 10
• You are flying a kite with 35 ft of string. All
  of a sudden, your kite touches the top of a 20 ft
  electric tower. OWW!!!! How far are you away
  from the tower?
• 4. Brain teaser

Warm-up Session 51
Obtuse
Impossible
Obtuse
28.72 feet
A B O S P A
A E R E P N N G A
L A N
Fruit Loops
2
Agenda for today
Fri 9.1

• Warm up
• Notes 9.1
• Practice
• Get Ch. 8 test back

Mon 9.2 9.3
Tues Quiz 9.1-9.3
Wed 9.4
Thur 9.5
3
Questions about hw?
What questions do you have about your hw?
P. 538 7 30 all P. 546 8 25, 37, 44, 45
4
Vocabulary Quiz 10

• It says 11, change it to say 10
• Please use all caps when writing your answers

5
9.1 Geometry Mean
9.1 Geometric Mean
Remember Given two numbers a and b, x is the
geometric mean if
EXTREMES
MEANS
6
Find the geometric mean of 9 and 16
General Formula for Geometric Mean
7
Altitudes!!!! What do you remember?
C
A
An Altitude Starts at a vertex Forms a right
angle
D
B
8
The geometric mean will always come from the big
triangles right angle.
C
A
There are 3 geometric means CA, CD, CB
D
B
9
The Swim
C
A
D
B
10
The Cobra
A
D
B
C
11
The Cobra
A
D
B
C
the LEG is the geometric mean
12
EX 1 Find x
C
A
x
9
x
x
16
16
D
9
B
13
EX 2 Find the length of AB.
A
32
15
15
32
x
D
32
B
C
14
EX 3 Solve for x
C
A
4
4
3
x
4
x
D
3
B
15
EX 4 Find the length of CB.
A
x
32
50
x
50
D
32
x 40
B
C
x
16
EX 5 Solve for x
C
A
5
5
x
12
5
12
D
x
B
17
Let's Practice !!! Pg. 531 13-24, 41-42
18
Math Rocks!!!
Quiz Next Class over 9.1 - 9.3!!