You are Here: Home >< A-levels

# Coordinate geometry HELP

1. my textbook has this question and I have no idea of what it is asking or what I have to do so pls help....
sketch the circle (x+2)^2+(y-3)^2=16 and find the equations of the four tangents to the circle which are parallel to the co-ordinate axis ???
2. (Original post by Wordnerd2)
my textbook has this question and I have no idea of what it is asking or what I have to do so pls help....
sketch the circle (x+2)^2+(y-3)^2=16 and find the equations of the four tangents to the circle which are parallel to the co-ordinate axis ???
Which part don't you understand? If it's the first part, look up the equation of a circle in your textbook. It's been given to you in a very standard format so you just need to look up how to interpret it. If it's the second part, you need to look at your graph and figure out where you can draw tangents that are parallel to the x and y axes.
3. (Original post by Wordnerd2)
my textbook has this question and I have no idea of what it is asking or what I have to do so pls help....
sketch the circle (x+2)^2+(y-3)^2=16 and find the equations of the four tangents to the circle which are parallel to the co-ordinate axis ???
Find equations of the green lines.

4. Work out the centre of the circle and the radius, and then work out the coordinates of the points where the tangent meets the circle? the lines looks like they're perpendicular to each other so find the gradient and then do -1/m? I hope this is helpful.

Posted from TSR Mobile
5. (Original post by Habeebah)
the lines looks like they're perpendicular to each other so find the gradient and then do -1/m? I hope this is helpful.

Posted from TSR Mobile
Nope. No need, and in addition, you will get division by 0 if you do that.
6. OHHH crap yeah cause the gradien's 0. I'm sure the answer is simple though

Posted from TSR Mobile
7. (Original post by rdkgames)
find equations of the green lines.

thank youuuuu

## 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: October 2, 2016
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

Stick or dump?

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets