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Reply 20

davros

Original post by madfish

but their division by 2 is surly not correct? :confused:

Why not???

Reply 21

joostan

Original post by madfish

but their division by 2 is surly not correct? :confused:

They find the midpoint of the line and STATE that it is equal to (b,2a) which is correct. They then solve the corresponding equations correctly.

Reply 22

purplemind

Original post by madfish

but their division by 2 is surly not correct? :confused:

How do you find a midpoint?
Add x1 and x2 and divide by 2, same with y coordinates.
And you know that centre is a midopoint, you have its coordinates given so you make the two things equal!

Reply 23

madfish

Original post by purplemind

How do you find a midpoint?
Add x1 and x2 and divide by 2, same with y coordinates.
And you know that centre is a midopoint, you have its coordinates given so you make the two things equal!

Im sorry but I dont get what you mean :|

2a-4 / 2 = a-2 not 2a? surly?

Reply 24

madfish

Original post by joostan

They find the midpoint of the line and STATE that it is equal to (b,2a) which is correct. They then solve the corresponding equations correctly.

how is it equal to b,2a ?!?

omg, i get it now

thnanks :colondollar:

Reply 25

joostan

Original post by madfish

how is it equal to b,2a ?!?

omg, i get it now

thnanks :colondollar:

Reply 26

purplemind

Original post by madfish

Im sorry but I dont get what you mean :|

2a-4 / 2 = a-2 not 2a? surly?

You are given 2 information:
2 points - what you do is to find the midpoint, its true that when you divide 2a-4 by 2 you get a-2
but you know that the midpoint is a circle centre so 2a-4/2=2a
since you are given the coordinates of a circle centre

Are you blonde? :biggrin: