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Which Rule? Pythagoras or Trigonometry?
Transcript
is it...
SOHCAHTOA?
0r is it?
PYTHAGORAS?
In your groups write down as much as you remember.
Can you come up with a rule of when to use Pythagoras and when to use SOHCAHTOA?
When I see a diagram like this, how do I know which of my rules to apply?
Task
You have 12 cards can you sort them into 2 groups depending on what method you think you should use?
Group 1: Pythogras
Group 2: Trigonometry
Pythagoras
a
c
Which rule should I use?
Trigonometry
b
Opposite
Hypotenuse
x
Pythagoras
Adjacent
SOHCAHTOA
SOHCAHTOA
Which to use?
Find x
5cm
7cm
3cm
x
2
1
Trigonometry
B,D,F,H,J
Pythagoras
A,C,E,G,I,K,L
x
3cm
Find x
7cm
4cm
x
4
3
40
8cm
Remember....
The key is to remember the formula
Can you state the two different formula?
What type of triangle do we have?
What is Pythagora's theorem?
What does SOHCAHTOA stand for?
Can you remember how to label the triangle?
Pythagoras
Which do I choose?
When you have 2 lengths and want to find the third missing length
Trigonometry
When you have 2 lengths and want to find an angle
OR
If you have a length and angle and want to find a missing length
I
A
E
L
G
C
K
Choose a template
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