Circle Theorems Flashcards
0
Q
Angle in a semicircle
A
The angle in a semi circle is 90*.
1
Q
Angles at the centre and at the circumference
A
The angle at the centre is twice the angle at the circumference.
2
Q
Angles in the same segment
A
Angles in the same segment are equal.
3
Q
Angles in a cyclic quadrilateral
A
Opposite angles in a cyclic quadrilateral add up to 180*.
4
Q
Length of tangents
A
The length of the two tangents from a point to a circle are equal.
5
Q
Angle between a circle radius and tangent
A
The angle between a tangent and a radius in a circle is 90*.
6
Q
Alternate segment theorem
A
Chord splits a circle into two segments. The angle facing the chord on one side, and the angle which is partly in the other segment and outside of the circle, are equal. (oe)
