Coordinate geometry of a circle

Question 1

What’s the usual equation for circle geometry?

Answer 1

(x-a)^2 + (y-b)^2 = r^2

Question 2

What is the normal?

Answer 2

Straight line perpendicular to the tangent
Ig it goes down to the centre of circle maybe?

Question 3

What is a tangent?

Answer 3

A line that touches a circle at only one point

Question 4

From the beginning tho, how do u find the equation of a circle?

Answer 4

1) Get its centre (prob have to find mp possibly)
2) Get its radius (use pythagoras theorem, the radius is the hypotenuse)
3) sub into (x-a)^2 + (y-b)^2 = r^2