Circle Theorems Flashcards
1
Q
The angle in a semi circle
A
Is a right angle 90
2
Q
Opposite angle of a cyclic quadrilateral
A
Add up to 180
3
Q
Exterior angle of a cyclic quadrilateral
A
Equal to the interior of the opposite angle
4
Q
Lengths of two tangents exterior until a point
A
Are equal
5
Q
A tangent to the circle is
A
Always 90
6
Q
The angle at the centre is
A
twice the angle at the circumference
7
Q
Angles in the same segment
A
are equal
8
Q
The angle between the tangent and the chord at the point of contact is
A
equal to the angle in the alternate segment*
9
Q
Perpendicular from the centre
A
bisects the chord:
