Students' Heights 3 feet 11 inches 46 inches

1

• Students' Heights      3 feet 11 inches
  46 inches
• 4 feet 8 inches 48 inches  
  4 feet 2 inches  52 inches

Drew, Erin, Jamal, Kendra, Parker, and Sandy have
lined up according to height so they can be
placed on-stage for the spring concert. The
shortest person is at the front of the line.
Drew is behind Kendra. Erin is right behind
Parker. Jamal is between Parker and Drew. Sandy
is one inch shorter than Kendra. Kendra is
second in line. What is each person's height in
feet and inches? In what order are they standing
in line?
2
Solution

• Height Student
• 3 feet 10 inches Sandy
• 3 feet 11 inches Kendra
• 4 feet Drew
• 4 feet 2 inches Jamal
• 4 feet 4 inches Parker
• 4 feet 8 inches Erin

3
Classifying and Measuring Angles

• Lesson 10-1

4
Angles

• An angle is made up of 2 rays with a common end
  point.
• Angles are measured in units called degrees.

Vertex- the point where the 2 rays meet.
5
Naming Angles
C
You can use the symbol to name the angle.
B
2
ABC or CBA Always use the vertex as the middle
letter.
A
B Use the vertex only
2 Use a number
6
Types of Angles
Acute Angle
Right Angle
Measure less than 90
Measure exactly 90
Straight Angle
Obtuse Angle
Measure between 90 and 180
Measure exactly 180
7
Find the measure of an angle
P
M
60
85
R
N
8
The outer scale goes from 0 to 180 from left to
right.
Protractor
The inner scale goes from 0 to 180 from right to
left.
9
How to measure an angle
If the ray passes through this zero, use the
inner scale.
If the ray passes through this zero, use the
outer scale.
Line up the vertex of the angle with the center
of the protractor.
Lay one of the rays of the angle on the line
passing through zero.
10

• Measure this angle from the inner scale.
• This angle measures 75

11

• Measure this angle from the outer scale.
• This angle measures 100

12
Draw an Angle that measures 60
First draw a ray.
Next lay the protractor on top of the ray with
the end point at the center of the ray.
13
Draw an Angle that measures 60
Then draw the other ray passing it through this
point.
Mark the point on the protractor that you want
the other ray to pass through.
14
Draw an Angle that measures 60
15
Your Turn

• Measure the angles on your worksheet.
• Draw your own angle that measures 45
• Remember to line up the vertex with the center
  point.
• If you need to extend the ray so that it passes
  through the zero mark.

16
Dont forget

• Complete lesson 10-1 1-14 all