Circle theorems Flashcards
(7 cards)
1
Q
What is a tangent?
A
A tangent is a line that just touches a single point on the circumference of a circle
2
Q
What does a tangent make with a radius?
A
A tangent always makes an angle of 90° with the radius it meets at that point
3
Q
What do two radii form?
A
Two radii form an isosceles triangle
4
Q
What is a chord?
A
A chord is any line drawn across a circle
5
Q
Angle at centre and angle at circumference rule?
A
The angle subtended at the centre of a circle is double the angle subtended at the circumference from the same two points
6
Q
Angle in a semicircle?
A
- The angle in a semi circle is 180°
- A triangle drawn from the two ends of a diameter will always make an angle of 90° where it hits the circumference
7
Q
A
