You are Here: Home >< Maths

# Circles help

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. Hi, I was wondering if anyone could help me on part of this question? Here's the information ive already been given/worked out: the points P (9,3) and Q (1,-3) lie at opposite ends of a circle - radius=5, centre= (5,0) equation of circle= (x-5)^2 + (y-0)^2 = 5^2
Describe a geometrical transformation by which C can be obtained from the circle with the equation x^2 + y^2 = r^2
I don't really get this...is it just 5^2 - 0^2 = 5^2? I don't get what I'm supposed to be writing
2. Are you sure that it is

3. Do you know what transformation is needed to go from f(x) to f(x-5)
4. (Original post by TenOfThem)
Do you know what transformation is needed to go from f(x) to f(x-5)
in regards to your first post, yes it definitely says in the question: describe the geometrical transformation by which C can be obtained from the circle with the equation x^2 +y^2= r^2

and yeah, that would be a translation by vector (5,0) right?
is that what it is, because thats the coordinates of the centre? not sure how to use x^2 +y^2= r^2 with it though
5. So, to go from

to

would be a translation as you say

How might you transform a circle radius = 1 to a circle radius = 5
6. (Original post by TenOfThem)
So, to go from

to

would be a translation as you say

How might you transform a circle radius = 1 to a circle radius = 5
ermmmmmmm an enlargement? scale factor 5? thats a complete guess aha:/

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: March 26, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.