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3Tvwo §6.3 / 3Thavo §6.4
§6.3 Sine and cosine
First a look back at §6.2!
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Wiskunde
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vwo
Leerjaar 3
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§6.3 Sine and cosine
First a look back at §6.2!
Slide 1 - Tekstslide
2
a
If 6 =
then a = ......
Slide 2 - Woordweb
a
3
2
If 4 =
then a = .....
Slide 3 - Woordweb
Using the tangent to calculate the angle of elevation.
+ Take an empty space in your notebook and first
+ Make a Sketch of this:
Slide 4 - Tekstslide
The Sketch:
Slide 5 - Tekstslide
Now calculate:
+ the angle of elevation
+ using a. your Sketch and
b. your calculator
Slide 6 - Tekstslide
Solution:
Slide 7 - Tekstslide
Difference between a tangent and an angle.
A
there is none, in fact
B
a tangent is about steepness; an angle is not
C
an angle is in degrees; a tangent is a number
D
an angle is a number; a tangent is in degrees
Slide 8 - Quizvraag
you use 'shift tan' on the Casio, when you
A
know the angle and you want to know the tangent.
B
know 2 sides of a right-angled triangle and you want to calculate the 3rd side.
C
know the tangent and you want to know the angle.
D
want to round an angle to a whole number of degrees.
Slide 9 - Quizvraag
Homework time.
Do §6.3 now.
Later this LessonUp will be continued.
timer
5:00
Slide 10 - Tekstslide
What's new in §6.3 ?
A lot!
The reason for this: sometimes it is better to use:
SINE or COSINE than TANGENT!
Just watch the next slide!
You will also see a way to remember all three of them!
Slide 11 - Tekstslide
Slide 12 - Tekstslide
Three more things...
1. Which angle is meant?
2. A mistake in the book!
3. A joke (or two).
Slide 13 - Tekstslide
Slide 14 - Tekstslide
1. Which angle do you mean?!?
Slide 15 - Tekstslide
2. Mistake in the book, p.201:
16d, 'Angle S' should be 'Angle P'!
Correct this, with a pencil.
Slide 16 - Tekstslide
Slide 17 - Tekstslide
Homework time again.
Try to finish the paragraph.
Slide 18 - Tekstslide
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