This is not a TeeEm thread - I'm genuinely stuck
The question : AB = AC. Find the value of theta. Ignore the 'b' in the diagram - not relevant to the question.
A teacher gave this question to one of my tutees, probably not realising how hard it is. The best I've done is get to a quartic but I could've made a mistake and I couldn't solve the quartic directly anyway.
Help!
(Please post any solutions in spoilers)
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Notnek
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- 06-03-2016 14:52
Last edited by Notnek; 06-03-2016 at 15:09. -
Asuna Yuuki
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- 06-03-2016 14:56
no thanks
that is not a fun looking question...
just had a very brief attempt but got scared off pretty quickly xD -
TheConfusedMedic
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- 06-03-2016 15:00
What study level is this?
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- 06-03-2016 15:01
(Original post by notnek)
This is not a TeeEm thread - I'm genuinely stuck
The question : AB = AC. Find the value of theta.
A teacher gave this question to one of my tutees, probably not realising how hard it is. The best I've done is get to a quartic but I could've made a mistake and I couldn't solve the quartic directly anyway.
Help! -
Notnek
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- 06-03-2016 15:04
(Original post by thefatone)
doesn't seem too difficult i'm doing it currently -
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- 06-03-2016 15:06
(Original post by notnek)
I could just be being stupid. -
Notnek
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- 06-03-2016 15:06
I have no idea where the teacher got the question from or if they made it themselves. -
morgan8002
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- 06-03-2016 15:07
(Original post by notnek)
This is not a TeeEm thread - I'm genuinely stuck
The question : AB = AC. Find the value of theta.
A teacher gave this question to one of my tutees, probably not realising how hard it is. The best I've done is get to a quartic but I could've made a mistake and I couldn't solve the quartic directly anyway.
Help!
(Please post any solutions in spoilers) -
Notnek
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- 06-03-2016 15:09
(Original post by morgan8002)
Are we solving it in terms of b or is b to be determined somehow?
No you're meant to find the theta angle. The 'b' is not relevant to the question. -
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- 06-03-2016 15:16
(Original post by notnek)
Finding it in terms of b would be too easy!
No you're meant to find the theta angle. The 'b' is not relevant to the question. -
the bear
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- 06-03-2016 15:23
presumably you mean find theta in terms of b
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morgan8002
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- 06-03-2016 15:23
(Original post by notnek)
Finding it in terms of b would be too easy!
No you're meant to find the theta angle. The 'b' is not relevant to the question.
edit: No it was wrong. I have another idea though.Last edited by morgan8002; 06-03-2016 at 15:37. -
Notnek
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- 06-03-2016 15:25
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TheConfusedMedic
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- 06-03-2016 15:26
(Original post by notnek)
The student who was given this question is in Year 13 doing A Level Maths (not further maths).
I have no idea where the teacher got the question from or if they made it themselves.(which is still wrong)
Posted from TSR Mobile -
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- 06-03-2016 15:29
(Original post by morgan8002)
I got I have no idea if that's right though. I'm attempting to check but it's a mess. -
Student403
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- 06-03-2016 15:36
(Original post by drandy76)
just checking how that would fit with the other angles around the triangle suggest that you're right,granted i could've made a mistake checking to see if you made one -
morgan8002
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- 06-03-2016 15:38
(Original post by drandy76)
just checking how that would fit with the other angles around the triangle suggest that you're right,granted i could've made a mistake checking to see if you made one -
Student403
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- 06-03-2016 15:39
(Original post by morgan8002)
I got I have no idea if that's right though. I'm attempting to check but it's a mess.
edit: No it was wrong. I have another idea though.
I just checked using the sine and cosine rules and 90 was fine -
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- 06-03-2016 15:41
(Original post by morgan8002)
I got I have no idea if that's right though. I'm attempting to check but it's a mess.
edit: No it was wrong. I have another idea though. -
morgan8002
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- 06-03-2016 15:43
, which I wrote down the wrong solution
. There was something else that could have been 0 instead which I'm working on now, but I don't see any reason why I would accidentally come up with the right answer.
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