# trigonometry

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#1
can someone help me with a trigonometry question
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1 month ago
#2
(Original post by louise18152)
can someone help me with a trigonometry question
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#3
(Original post by mqb2766)
hi the question was the triangle ABC is ab-12cm,bc=10cmand cAb=45 degrees
and I have to find what the values for bAc and aBc are
then find the area
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1 month ago
#4
(Original post by louise18152)
hi the question was the triangle ABC is ab-12cm,bc=10cmand cAb=45 degrees
and I have to find what the values for bAc and aBc are
then find the area
Can you sketch it (and upload)?
What rules do you know that might be useful to find the angles?
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#5
i

(Original post by mqb2766)
Can you sketch it (and upload)?
What rules do you know that might be useful to find the angles?
I've drawn it but I don't know how to upload it
I still don't know
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1 month ago
#6
(Original post by louise18152)
i

I've drawn it but I don't know how to upload it
I still don't know
If you press the camera icon at the top of the Reply, you can upload an image.
For the angles - sides you're given, how are they related?
Is it a right angled triangle?
If not, which (two) rules do you know?
Which one matches the information you're given & want to find.
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#7
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#8
(Original post by mqb2766)
If you press the camera icon at the top of the Reply, you can upload an image.
For the angles - sides you're given, how are they related?
Is it a right angled triangle?
If not, which (two) rules do you know?
Which one matches the information you're given & want to find.
it not a right angle
the sine and cosine rules
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1 month ago
#9
(Original post by louise18152)
it not a right angle
the sine and cosine rules
Yes, so which one is appropriate here to find the first angle?
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#10
(Original post by mqb2766)
Yes, so which one is appropriate here to find the first angle?
sine 45/10=sinec/12
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1 month ago
#11
(Original post by louise18152)
sine 45/10=sinec/12
So solve.
Then how do you simply get the third angle?
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#12
(Original post by mqb2766)
So solve.
The how do you simply get the third angle?
could you do 180 -45 - 58.05
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1 month ago
#13
(Original post by louise18152)
could you do 180 -45 - 58.05
If course.
Then you know two sides and the angle between them, so the area is given by ...
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1 month ago
#14
I’m pretty sure you use the sine rule (don’t forget to label the sides as either a, b and c)
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#15
(Original post by TurtlePowerXII)
I’m pretty sure you use the sine rule (don’t forget to label the sides as either a, b and c)
(Original post by mqb2766)
If course.
Then you know two sides and the angle between them, so the area is given by ...
1/2ab sinc
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1 month ago
#16
(Original post by louise18152)
1/2ab sinc
Yes. I've told you nothing here, you know how to do it.
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#17
(Original post by mqb2766)
Yes. I've told you nothing here, you know how to do it.
would you be able to help with other
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1 month ago
#18
(Original post by louise18152)
would you be able to help with other
Just upload, but have a think about what you think you'd do first.
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#19
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1 month ago
#20
(Original post by louise18152)
There isn't a question, but assuming it's similar to the last, how would you go about getting extra angles (and side) and area.
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