circle theorems Flashcards
1
Q
angles at a tangent
A
angle between a radius and tangent meet at 90 degrees
2
Q
angle at circumference
A
angle subtended at centre is twice the angle at the circumference
3
Q
angles in a cyclic quadrilateral
A
angles in a cyclic quadrilateral sum to 180
4
Q
alterante segment theorem
A
angles in the same segment are equal
5
Q
angles in a semicircle
A
angles in a semicircle sum to 90 degrees
6
Q
angles on the diameter of a circle
A
angle subtended on the diameter of a circle is always a right angle
7
Q
tangent theorem
A
any two tangents from the same point are the same length
