Maths homework help :/

Goose+ · January 22nd, 2007, 4:46 PM

I am struggling with the last question on my Maths homework. It is very difficult and is to do with circle properties. I would greatly appechiate it if anyone could help find me the awnswer and explain how they reached it. I have done the other 9.

This is a scan of the question from my text book:

http://img260.imageshack.us/img260/9476/hardmaths5xy.png

The words half copied on the left hand side are: the (first line) and write (second line).

Please help images/smilies/love.gif

chaos386 · January 22nd, 2007, 5:04 PM

I got an answer, but I don't know if your teacher would accept it. I arrived at it by taking the limit of y as x approaches zero and then doubling the result.

CyberMonkey · January 22nd, 2007, 5:04 PM

CD is a diameter? So it goes through the middle point? Bad picture.

vRS · January 22nd, 2007, 5:09 PM

Never done this before in maths all I can say is x +2y = 180 degrees obviously so y is 60 degrees.

CyberMonkey · January 22nd, 2007, 5:18 PM

http://webs.hogent.be/~041294bm/misc/math.JPG

I think I got it (whoah! I'm so proud of myself!)

el_maggot · January 22nd, 2007, 5:21 PM

What terrible handwriting images/smilies/tongue.gif

chaos386 · January 22nd, 2007, 5:22 PM

Quote:

Originally Posted by vRS

Never done this before in maths all I can say is x +2y = 180 degrees obviously so y is 60 degrees.

He's not looking for y though, because it doesn't have a fixed value. And x + 2y doesn't equal 180 degrees, either. images/smilies/wink.gif

CyberMonkey · January 22nd, 2007, 5:23 PM

Quote:

Originally Posted by el_maggot

What terrible handwriting images/smilies/tongue.gif

That's to make him at least think a bit images/smilies/wink.gif

chaos386 · January 22nd, 2007, 5:29 PM

Quote:

Originally Posted by CyberMonkey

http://webs.hogent.be/~041294bm/misc/math.JPG

I think I got it (whoah! I'm so proud of myself!)

Would you be terribly disappointed if I told you that the sum of the angles in a triangle isn't 360 degrees? images/smilies/tongue.gif

(good job on noticing the isosceles triangle btw)

YF19pilot · January 22nd, 2007, 5:36 PM

Quote:

Originally Posted by chaos386

I got an answer, but I don't know if your teacher would accept it. I arrived at it by taking the limit of y as x approaches zero and then doubling the result.

That seems a bit over the head. This problem is more geometric than calculus.

Quote:

Originally Posted by vRS

Never done this before in maths all I can say is x +2y = 180 degrees obviously so y is 60 degrees.

Incorrect because of:

Quote:

Originally Posted by CyberMonkey

CD is a diameter? So it goes through the middle point? Bad picture.

The problem with this problem is that there are no givens, outside of the fact that CD is the diameter of the circle and that AB is tangent to the circle. The inside angle of the triangle BCT and triangle BDT are not given, therefore you cannot assume x + 2y = 180. That and saying that "x + 2y = 180 there for y=60" is also incorrect because as far as we know x does not equal y, and BCT is not an equallateral or isocolies triangle.

CyberMonkey · January 22nd, 2007, 5:37 PM

FFS

What a stupid mistake. but no problem since that means 2y+x=270-180=90 images/smilies/smile.gif

@YF19pilot: you can't open the picture? Blame my school, it's their hosting images/smilies/smile.gif

Goose+ · January 22nd, 2007, 5:37 PM

Yes. Thanks images/smilies/biggrin.gif

YF19pilot · January 22nd, 2007, 5:40 PM

Quote:

Originally Posted by CyberMonkey

FFS

What a stupid mistake. but no problem since that means 2y+x=270-180=90 images/smilies/smile.gif

@YF19pilot: you can't open the picture? Blame my school, it's their hosting images/smilies/smile.gif

No you posted after I started writing...also wasn't really looking into it, but I saw what you did, the triangle in the circle >.<

matt2000 · January 22nd, 2007, 10:10 PM

oh christ i remember this from last year. looks like you've got yourself some good tutors here.

IVIaster · January 22nd, 2007, 10:16 PM

Calculated myself and got x + 2y = 90

toma_alimosh · January 22nd, 2007, 11:45 PM

Quote:

Originally Posted by IVIaster

Calculated myself and got x + 2y = 90

correct

LeMans GTR · January 23rd, 2007, 3:20 AM

ah shoot I got 84 but then again Im only 11 images/smilies/tongue.gif

pfrocker · January 23rd, 2007, 7:18 AM

lets make this the official math help topic.

matt2000 · January 23rd, 2007, 7:51 AM

good idea. i've just done an AS maths exam and that was (slightly) hard. i'm sure some peple could use some help too.

Peter3hg · January 23rd, 2007, 8:07 AM

Quote:

Originally Posted by matt2000

good idea. i've just done an AS maths exam and that was (slightly) hard. i'm sure some peple could use some help too.

I did my A2 Maths on Thurs. It was ridiculously hard. Full of sin, cos, tan, cot, cosec, sec, arcsin, arccos, arctan and some other shit I hate.

January 22nd, 2007, 4:46 PM	#1
Goose+ Joined: Oct 11th, 2006 Last Online: November 17th, 2009 Location: The English Marxist State Age: 19 Posts: 1,087 Car: Honda Jazz Rep Power: 21	Maths homework help :/ I am struggling with the last question on my Maths homework. It is very difficult and is to do with circle properties. I would greatly appechiate it if anyone could help find me the awnswer and explain how they reached it. I have done the other 9. This is a scan of the question from my text book: The words half copied on the left hand side are: the (first line) and write (second line). Please help

January 22nd, 2007, 5:04 PM	#2
chaos386 .sa = bad driver! Joined: Nov 8th, 2004 Last Online: Yesterday Location: Al-Khobar, Saudi Arabia Age: 23 Posts: 4,609 Car: 2009 Seat Leon FR LFS Status: Rep Power: 144	I got an answer, but I don't know if your teacher would accept it. I arrived at it by taking the limit of y as x approaches zero and then doubling the result. __________________ "Shit, that's a busy table cloth." -matt2000

January 22nd, 2007, 5:21 PM	#6
el_maggot Joined: Oct 16th, 2006 Last Online: November 18th, 2009 Location: Dubai,United Arab Emirates Age: 18 Posts: 170 Rep Power: 0	What terrible handwriting __________________

January 22nd, 2007, 5:37 PM	#11
CyberMonkey Joined: Jan 22nd, 2005 Last Online: November 16th, 2009 Location: Belgium Age: 23 Posts: 2,023 Rep Power: 38	FFS What a stupid mistake. but no problem since that means 2y+x=270-180=90 @YF19pilot: you can't open the picture? Blame my school, it's their hosting

January 22nd, 2007, 10:10 PM	#14
matt2000 Hedgehog Sandwich Joined: Feb 17th, 2006 Last Online: 2:26 AM Location: Meerkat Harborough, UK Age: 19 Posts: 5,616 Car: 1977 lol sprung Land Rover shed LFS Status: Rep Power: 101	oh christ i remember this from last year. looks like you've got yourself some good tutors here. __________________ Forza 3 Owners Club

January 22nd, 2007, 5:09 PM	#4
vRS Joined: Nov 22nd, 2004 Last Online: November 11th, 2009 Location: Stirling, Scotland Age: 18 Posts: 1,832 Car: '02 Vauxhall Corsa SXi Rep Power: 35	Never done this before in maths all I can say is x +2y = 180 degrees obviously so y is 60 degrees.

January 22nd, 2007, 5:18 PM	#5
CyberMonkey Joined: Jan 22nd, 2005 Last Online: November 16th, 2009 Location: Belgium Age: 23 Posts: 2,023 Rep Power: 38	http://webs.hogent.be/~041294bm/misc/math.JPG I think I got it (whoah! I'm so proud of myself!)

January 22nd, 2007, 5:37 PM	#12
Goose+ Joined: Oct 11th, 2006 Last Online: November 17th, 2009 Location: The English Marxist State Age: 19 Posts: 1,087 Car: Honda Jazz Rep Power: 21	Yes. Thanks

January 22nd, 2007, 10:16 PM	#15
IVIaster Not a dude. Joined: Dec 10th, 2005 Last Online: Yesterday Location: Finland Posts: 738 Car: 1990 Volvo 740 Rep Power: 17	Calculated myself and got x + 2y = 90

January 23rd, 2007, 3:20 AM	#17
LeMans GTR Previously Known As CSL Joined: Dec 20th, 2006 Last Online: 2:31 AM Location: Australia Age: 14 Posts: 2,727 Car: Aston Martin DBS (I wish) Rep Power: 38	ah shoot I got 84 but then again Im only 11 __________________

January 23rd, 2007, 7:18 AM	#18
pfrocker Joined: Jan 22nd, 2006 Last Online: 2:40 AM Location: San Francisco, California, USA Age: 21 Posts: 2,137 Rep Power: 45	lets make this the official math help topic. __________________ "The following program contains British accents, if you don't understand what the bloody hell we are talking about please turn on your closed captioning." -BBC America Top Gear Introduction narrated by John Oliver

January 23rd, 2007, 7:51 AM	#19
matt2000 Hedgehog Sandwich Joined: Feb 17th, 2006 Last Online: 2:26 AM Location: Meerkat Harborough, UK Age: 19 Posts: 5,616 Car: 1977 lol sprung Land Rover shed LFS Status: Rep Power: 101	good idea. i've just done an AS maths exam and that was (slightly) hard. i'm sure some peple could use some help too. __________________ Forza 3 Owners Club

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