1.3: day 1 - angles. homework review mental math what is the value of the digit? write your answer...
TRANSCRIPT
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1.3: Day 1 - Angles
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Homework Review
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Mental Math
What is the value of the digit?
Write your answer on your slate.
What is the value of the 6 in 67?
What is the value of the 9 in 903?
What is the value of the 4 in 1,416?
What is the value of the 2 in 3,128?
What is the value of the 4 in 14,002?
What is the value of the 3 in 346,041?
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Math Message
Use the given straws to create an angle.
Be ready to share.
Let’s learn more from BrainPop.
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What is an angle?
D O
A angle is two rays or line
segments that share a common endpoint, called
the vertex.
G
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Naming AnglesA B
How to name angles:• The vertex is one way to name an angle. See above – the angle could be named B because B is the vertex of the angle.
• Remember that the middle letter in the name of the angle is always the vertex – it is a VERTEX SANDWICH
• Is angle CBA a way to name this angle? Why or why not?
• How about angle BAC? Why or why not?
vertex
C
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Let’s make different types of angles with our straws!
An acute angle is an angle that is smaller than a right angle.
Try it: first create a right angle. Then move one of the straws to make the angle smaller
than the right angle.
right angle
has a square corner
V
A
E
S
ON
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Let’s make different types of angles with our straws!
An obtuse angle is an angle that is larger than a right angle.
Try it: first create a right angle. Then move one of the straws to make the angle larger
than the right angle.
right angle
has a square corner
V
A
E
T
OY
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Let’s make different types of angles with our straws!
A straight angle is an angle that looks like a line or line segment with three points.
Try it: first create a right angle. Then move one of the straws to make the angle
straight.
right angle
has a square corner
V
A
E
C O W
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Important ideas to remember about angles
• Angles can be formed by two rays or two line segments that share a common endpoint
• The common endpoint is called the vertex• The vertex is always named in the middle
of an angle• When you draw an angle, make sure you
use a half circle to show the viewer where to look This shouts, look here!
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Complete MJ page 6 with a partner
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Wrap it UP!
Go on an angle scavenger hunt with a partner:
• Find one acute angle• Find one right angle• Find one straight angle• Find one obtuse angle
Be ready to share!
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Tonight’s HomeworkIn your Math Notebook, define, draw and label
•a point
•a line
•a line segment
•a ray
•an angle
•an obtuse angle
•an acute angle
•a right angle.
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Math Boxes