Circle theory Flashcards
1
Q
A
The angle in a semi-circle is a right angle / 90o
2
Q
A
The perpendicular from a chord to the centre of the circle bisects the chord
3
Q
A
The angle between a tangent and a chord is equal to the angle in the alternate segment
Alternate segment theorem
4
Q
A
The angle at the centre of the circle is twice the angle on the circumference
5
Q
A
Angles in the same segment are equal
6
Q
A
Opposite angles of a cyclic quadrilateral add up to 180o
7
Q
A
Tangent meets radius at 90o
8
Q
A
2 tangents from the same point are equal = isosceles triangle
9
Q
A
Angles at the base of an isosceles triangle are equal
