# Proportion to prove graphs similar [Solved!]

**Nicole** 24 Nov 2015, 10:13

### My question

How do you write a proportion to prove the graphs are similar?

### Relevant page

7a. Math of Beauty

### What I've done so far

Written various fractions and tried to make them equal to proportions, but I didn't get it.

X

How do you write a proportion to prove the graphs are similar?

Relevant page
<a href="/numbers/math-of-beauty.php">7a. Math of Beauty</a>
What I've done so far
Written various fractions and tried to make them equal to proportions, but I didn't get it.

## Re: Proportion to prove graphs similar

**Newton** 24 Nov 2015, 20:09

Hello Nicole

Please give me more details about your question.

We normally talk about geometric shapes being "similar" (that is, exactly the same shape, but a different size) in which case we can express this as a proportion (like 1:3 means one of the shapes is 1/3 the size of the other).

But as for "similar graphs", I'll need to know more to help you.

Regards

X

Hello Nicole
Please give me more details about your question.
We normally talk about geometric shapes being "similar" (that is, exactly the same shape, but a different size) in which case we can express this as a proportion (like 1:3 means one of the shapes is 1/3 the size of the other).
But as for "similar graphs", I'll need to know more to help you.
Regards

## Re: Proportion to prove graphs similar

**Nicole** 25 Nov 2015, 07:32

I mean similar triangles and other shapes.

X

I mean similar triangles and other shapes.

## Re: Proportion to prove graphs similar

**Murray** 25 Nov 2015, 23:48

The proportions on this page may help:

Proofs with Similar Triangles

X

The proportions on this page may help:
<a href="http://www.regentsprep.org/regents/math/geometry/gp11/LsimilarProof.htm">Proofs with Similar Triangles</a>

## Re: Proportion to prove graphs similar

**Nicole** 26 Nov 2015, 19:26

So I could write something like

`(PQ)/(PR) = 3/4 = (AB)/(AC) = 6/8`

Does that make sense?

X

So I could write something like
`(PQ)/(PR) = 3/4 = (AB)/(AC) = 6/8`
Does that make sense?

## Re: Proportion to prove graphs similar

**Murray** 27 Nov 2015, 15:18

Yes, that would be fine as long as the SSS or SAS tests works for the 2 triangles PQR and ABC.

X

Yes, that would be fine as long as the SSS or SAS tests works for the 2 triangles PQR and ABC.

## Re: Proportion to prove graphs similar

**Nicole** 28 Nov 2015, 16:40

Thanks a lot.

## Re: Proportion to prove graphs similar

**Murray** 29 Nov 2015, 14:49

You are welcome, Nicole

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