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Homework Help If you're stuck with school work, ask in this forum for help from others.
Somebody Wanna Help Me With My Homework?? -
March 26th 2009, 09:06 PM
I don't know if anyone posts this stuff, but I really suckkk at Geometry, so if anyone happens to be wicked good, can you let me know if you wanna help?
Re: Somebody Wanna Help Me With My Homework?? -
March 26th 2009, 09:15 PM
I'm pretty decent at Geometry. What did you need help with?
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Re: Somebody Wanna Help Me With My Homework?? -
March 26th 2009, 09:32 PM
So here's my questions.
We're working on ratios which was from 9th grade algerabra but i don't understand it.
Pretty pathetic my teacher tells me.
Okay so heres the problem:
A line segment is divided into two segments, that are in the ratio 3:5. The measure of one segment is 12 centemeters longer than the measure of the other. Find the measure of each segment.
---So I drew a picture of a line. with a point dividing it into two. named one 3x and the other 5x. Thats all I have and its probably wrong. :]
Heres another question
Can the measures of a triangle be in the ratio 5:6:7? Why or Why not?
Re: Somebody Wanna Help Me With My Homework?? -
March 26th 2009, 09:38 PM
Quote:
Originally Posted by Christinaa317o8
So here's my questions.
We're working on ratios which was from 9th grade algerabra but i don't understand it.
Pretty pathetic my teacher tells me.
Okay so heres the problem:
A line segment is divided into two segments, that are in the ratio 3:5. The measure of one segment is 12 centemeters longer than the measure of the other. Find the measure of each segment.
---So I drew a picture of a line. with a point dividing it into two. named one 3x and the other 5x. Thats all I have and its probably wrong. :]
I'd have done the same thing. You also know that
Code:
5x = 3x + 12
which solves to give x = 6. Putting that back in we get 3x6cm = 18cm and 5x6cm = 30cm. As 30cm is 12cm bigger than 18cm the answer of 6cm is correct
Quote:
Heres another question
Can the measures of a triangle be in the ratio 5:6:7? Why or Why not?
By measures do you mean angles or lines?
I don't see why angles cannot. Since the sum of the angles in a triangle is 180 you can do
Code:
180/(5+6+7) = 10
so you could have 50, 60 and 70 degrees.
With sides I do not think so because if I construct a triangle with sides a=7x, b=6x and c=5x then by using the cos rule
Code:
cos(C) = (a²+b²-c²)/(2ab)
would give an angle of 0 degrees which evidently cannot be
Re: Somebody Wanna Help Me With My Homework?? -
March 26th 2009, 10:11 PM
I think it would be the ratio of them since they are proportional: mathematically (note I've took the reciprocal of QR/PQ and BC/AB to take out a step) :