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# Maths question trig? Watch

1. first use pyphagoras theorem to work out the hypoteneuese... then half that answer to make the side for the little isoscles triangle. then halve the 14 to make a right angled triangle. then you know 2 sides (the 7 cm along the bottom and the hypotenuese of the mini isosceles triangle) . then use trig and then double the angle to find ur answer. lol im trying my best not to tell u the answer...
2. (Original post by Forevereuphoria)
Sorry didn't notice your question I've done nothing that looks correct so theres no point me posting it.
From what others have said, best thing is to use Pythag theorem to get the diagonal length between the corners.

Then use either SOHCAHTOA or the Cosine Rule and you'll get the answer.

PS. to other people, remember not to post full solutions as its not allowed.
3. okay, first u find out the angle of the bottom triangle (the angle under x), so u divide 19 by 2 to make 9.5 (as dc=db). as you find the bottom angle using TOA, you find out the whole angle by using the trigonamonetry of the whole large triangle to find x+(the angle under x). once again u use the sides 19cm (bc) and 28 cm (ab) to find out the large angle (BAC) using TOA. then subtract the smaller angle under x (from the triangle DAB, THE TRIANGLE UNDER THE TRIANGLE WITH X) from the larger angle (BAC) from the large triangle (WHICH IS MADE OUT OF BOTH THE TRIANGLES) to find angle x. I hope this helps...
4. (Original post by 09dalvak)
okay, first u find out the angle of the bottom triangle (the angle under x), so u divide 19 by 2 to make 9.5 (as dc=db). as you find the bottom angle using TOA, you find out the whole angle by using the trigonamonetry of the whole large triangle to find x+(the angle under x). once again u use the sides 19cm (bc) and 28 cm (ab) to find out the large angle (BAC) using TOA. then subtract the smaller angle under x (from the triangle DAB, THE TRIANGLE UNDER THE TRIANGLE WITH X) from the larger angle (BAC) from the large triangle (WHICH IS MADE OUT OF BOTH THE TRIANGLES) to find angle x. I hope this helps...
is it 76
5. HELPPPP
6. Image attached
7. I got 76 for the first
Attached Images

8. (Original post by Forevereuphoria)
I got 76 for the first
Oooh, mymaths - what a wonderful website

Where have you got to so far? Talk me through it
9. Well I got 15.4183541
You do (tan-1(19/28))-(tan-1(9.5/28)=x
Sorry, I probably didn't explain it correctly to u.

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10. Hey, I'm going to move this to the Maths forum and have merged your threads together. There's no need to create 12 threads asking the same thing.
11. (Original post by Forevereuphoria)
Image is attached
Stop asking us to do all of your homework

Explain to your teacher that you do not know what to do and ask for some additional help

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