Ch6 Circles

Question 1

Circle equation centre(0,0)

Answer 1

x^2 + y^2 = r^2

Question 2

Circle equation centre(a,b)

Answer 2

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

Question 3

Circle theorem tangent

Answer 3

Tangent is perpendicular to radius of circle

Question 4

Circle theorem semicircle

Answer 4

Angle in semi-circle is 90°

Question 5

Circle theorem chord

Answer 5

perpendicular bisector of chord goes through centre of circle