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#1 2013-03-05 13:07:00

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

geometry

just started at geometry.

Two lines intersect such that the measure of each obtuse angle formed by the lines is three times the measure of each acute angle formed by the lines. What is the measure, in degrees, of an obtuse angle formed by the lines?


I see you have graph paper.
You must be plotting something
lol

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#2 2013-03-05 14:05:24

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,711

Re: geometry

Hi;

3x + x = 180

4x = 180

x = 45° that is the acute angle.

3x = 3 * 45 = 135° is the obtuse angle.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#3 2013-03-06 15:13:25

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

Re: geometry

What is the number of degrees in the smaller angle formed by the hands of a clock at 5:44?


I see you have graph paper.
You must be plotting something
lol

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#4 2013-03-06 15:33:36

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,711

Re: geometry

Hi;

I am getting 92° .


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#5 2013-03-06 15:35:07

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

Re: geometry

aw, i was off by 30...


I see you have graph paper.
You must be plotting something
lol

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#6 2013-03-06 15:38:53

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,711

Re: geometry

Use this to help you calculate it.

http://www.mathsisfun.com/flash.php?pat … +Animation


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#7 2013-03-06 20:33:59

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,121

Re: geometry

hi cooljackiec

At 5.44 the minute hand is pointing at exactly the 44 spot on the face.  So the angle between 00 minutes and 44 minutes will be 44/60 of 360 degrees ie. 6 degrees between each minute.

The hour hand will have moved somewhere between the 5 hour point and the 6 hour point.

That angle (5 - 6) is 5 x 6 = 30 degrees.  The hour hand is at 44/60 of that amount.  ie. 22 from the 5 point.  Put those two bits of information together and you will get the answer.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#8 2013-03-07 12:39:50

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

Re: geometry

can mathisfun use asymptote to draw pictures?


I see you have graph paper.
You must be plotting something
lol

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#9 2013-03-07 12:45:35

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,711

Re: geometry

Asymptote, that is a program that another forum uses isn't it?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

#10 2013-03-07 12:56:10

cooljackiec
Member
Registered: 2012-12-13
Posts: 160

Re: geometry

yes. It is in AoPS. How can we submit images other than hand drawing?


I see you have graph paper.
You must be plotting something
lol

Offline

#11 2013-03-07 12:57:05

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 81,711

Re: geometry

There are online drawing programs and there is the best, Geogebra!


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

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