Chapter 6: Circles

Question 1

Formula for finding the midpoint of a line segment

Answer 1

(X1+x2/2 , y1+y2/2)

Question 2

What is the equation of a circle?

Answer 2

X^2 + y^2 = radius^2

Question 3

What’s the equation of the circle with a centre (a,b) and radius of r?

Answer 3

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

Question 4

What is another form the equation of a circle cane be in? What will its centre and radius be?

Answer 4

X^2 + y^2 + 2fx + 2gy + c = 0
Centre =(-f,-g)
Radius = (square root) f^2 + g^2 - c