Question

Prove the following statement:

a:b = c:d, then a:c = b:d

To prove this use the following propositions.
p15: a:b = ma:mb
p11: a:b = c:d and c:d = e:f, then a:b = e:f
p14: a:b = c:d and a>== 12 years ago

Answer 1

What does a>=<c mean?

Answer 2

I am not sure, that is the notation in the book.

Answer 3

Can you take a picture and show me?

Answer 4

ok

Answer 5

ty

Answer 6

Thanks for showing. I am not familiar with this material at all. Sorry.

Answer 7

Thanks for looking.