Y1CH6 Circles Flashcards
1
Q
How do you work out the midpoint of a line?
A
(x1+x2/2) , (y1+y2/2) (x,y)
2
Q
The centre of the circle is the midpoint of what?
A
The diameter
3
Q
What is a perpendicular bisector?
A
A straight line that goes perpendicularly through the midpoint of a line
4
Q
What is the equation of a circle?
A
(x-a)^2 + (y-b)^2 = r^2
5
Q
How do you work out centre of the circle of
x^2 + y^2 + 2x + 5y + 20 = 0
A
Complete the square
6
Q
How many times can a straight line intersect a circle?
A
Once or twice
7
Q
A tangent to a circle is perpendicular to what?
A
The radius
8
Q
What is a chord
A
A line within a circle that connects to two points on the circumference of a circle
9
Q
What will a perpendicular bisector through a chord always go through?
A
The centre of a circle
10
Q
A
