You are Here: Home

# Angles Tweet

Maths and statistics discussion, revision, exam and homework help.

Announcements Posted on
TSR launches Learn Together! - Our new subscription to help improve your learning 16-05-2013
IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
Sign in to Reply
1. Angles
How would I prove this.

Angles.bmp
2. Re: Angles
What is <RQT ?

Then what is <TQU in terms of x?

Finally, what is QTU in terms of x?
3. Re: Angles
Look at shape its "S" angles.

so STQ = TQR

Therefore TQU = 100-X

As it is an isoceles triangle as 2 sides are same so the adjacent angle QUT is also 100-X

Therefore to find angle QTU we do:

Sum of angles in triangle = 180 degrees

=180-(100-x)+(100-x)

=180-(200-2x)

=-20-2x

=(2x-20)degrees
4. Re: Angles
(Original post by wenger16)
Look at shape its "S" angles.

so STQ = TQR

Therefore TQU = 100-X

As it is an isoceles triangle as 2 sides are same so the adjacent angle QUT is also 100-X

Therefore to find angle QTU we do:

Sum of angles in triangle = 180 degrees

=180-(100-x)+(100-x)

=180-(200-2x)

=-20-2x

=(2x-20)degrees
Please don't post full solutions.

It is one of the rules of this forum not to post solutions. Plus in this case it's much more beneficial for the OP to work through the problem himself considering his exam is coming up very soon.
5. Re: Angles
(Original post by wenger16)
Look at shape its "S" angles.

so STQ = TQR

Therefore TQU = 100-X

As it is an isoceles triangle as 2 sides are same so the adjacent angle QUT is also 100-X

Therefore to find angle QTU we do:

Sum of angles in triangle = 180 degrees

=180-(100-x)+(100-x)

=180-(200-2x)

=-20-2x

=(2x-20)degrees
How do you get from -2x to 2x
6. Re: Angles
Are you getting the 100-x from the z angle on STQ
7. Re: Angles
(Original post by zed963)
How do you get from -2x to 2x
Its equal you can always reverse signs.

or think of it as multiplying whole thing by -1.

ye its z angle so you know its 100-x
8. Re: Angles
(Original post by wenger16)
Its equal you can always reverse signs.

or think of it as multiplying whole thing by -1.

ye its z angle so you know its 100-x
Thanks for that.
Much appreciated.
9. Re: Angles
(Original post by wenger16)
Its equal you can always reverse signs.
Hope my bank doesn't agree.

Actually you made a mistake multiplying out the bracket.

(Original post by wenger16)

=180-(200-2x)

=-20-2x
180-(200-2x) = 180-200 + 2x = -20 + 2x
Sign in to Reply
Share this discussion:
Article updates
Moderators

We have a brilliant team of more than 60 volunteers looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is moderated by:
Reputation gems:
The Reputation gems seen here indicate how well reputed the user is, red gem indicate negative reputation and green indicates a good rep.
Post rating score:
These scores show if a post has been positively or negatively rated by our members.