Now what

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Now what?

• Talk about what we are doing the rest of the
  semester
• Brain Teaser
• Review Special Right Triangles
• Begin day 1 of the Unit Circle

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Can you only move one coin, to form two lines,
each containing 4 coins?
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Do you remember the SPECIAL RIGHT TRIANGLES?
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45-45-90 Right Triangle
45º
1
45º
1
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(No Transcript)
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45º
45º
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(No Transcript)
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30-60-90 Right Triangle
60º
2
1
30º
9
30º
60º
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30º
60º
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30º
60º
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This is a VERY important 45-45-90 triangle
45º
1
a
b
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This is a VERY important 30-60-90 triangle
60º
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This is a VERY important 30-60-90 triangle
60º
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The Unit Circle
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Imagine a circle with r 1 and the center at the
origin.
Now zoom into just Quadrant I
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(0, 1)
1
1
(1, 0)
Remember that the radius is 1.
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Remember that the radius is 1.
1
45
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Remember that the radius is 1.
1
30
20
1
Remember that the radius is 1.
60
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90
60
45
30
0
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90
60
45
30
0
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You need to MEMORIZE the
first quadrant of the unit circle for homework.
I would not be surprised if you had a pop quiz on
it next class.