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September 23rd, 2012, 08:23 AM   #1
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How can I find the ratio for these two shapes?

I know that in order to figure out the unknown sides in these two triangular I have to work out the ratio.

Problem 1: When I work out the ratio, how do I know which order to divide the numbers by? Ex. AB= 6 AND DE= 8. How am I supposed to know whether or not Im supposed to divide 6 by 8 or the opposite.

Problem 2: I order to figure out AC my book multiplied 10 with the ratio. I thought you would have to divide as AC is the smaller triangular? Attached Images 2.1.2.PNG (13.7 KB, 73 views) September 23rd, 2012, 08:55 AM #2 Newbie   Joined: Jan 2012 From: Singapore Posts: 15 Thanks: 0 Re: How can I find the ration for these two shapes? Either order will be fine because you are finding the ratio between two lengths that are in two similar figures. You will have to stick to the order that you have initially used for the rest of the calculations. For example, you used the big triangle over the small triangle, the ratio you have found would be a A:B On the other hand, if you have small over the big one, the ratio would be B:A. Second question is just playing around with the ratio as fractions, you can try doing it again, September 23rd, 2012, 12:39 PM #3 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 716 Re: How can I find the ration for these two shapes? You should use common sense. The triangle on the right is bigger, so the corresponding sides must be bigger. The ratio is 4/3, so going from left to right, multiply by 4/3, while going from right to left multiply by 3/4. Tags find, ratio, shapes Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post hellowz Algebra 3 July 4th, 2013 08:26 PM isaacalves Elementary Math 5 November 17th, 2012 04:49 AM stevecowall Algebra 2 February 29th, 2012 05:38 AM SolCon Number Theory 2 February 5th, 2011 01:47 AM mackenzieee Geometry 1 March 28th, 2010 03:39 PM

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