Circles Flashcards
1
Q
What is the equation of a circle with a centre (p,q) and a radius r?
A
(x - p)^2 + (y - q)^2 = r^2
2
Q
What would you do if the question asks about crossing an axis?
A
set y to 0 then solve, and do the same for x
3
Q
How do you find where the circle crosses the y axis?
A
Set x to 0
4
Q
What type of triangle is a triangle in a semi circle?
A
A right angle triangle
5
Q
What relationship do tangents have for radius’?
A
They are perpendicular
