circle theorems Flashcards
1
Q
what is a rule that involves angles at the centre and angles at the circumference?
A
the angle subtended from an arc at the centre is double the angle subtended at the circumference
2
Q
what is a cyclic quadrilateral?
A
a quadrilateral drawn inside a circle with all 4 points touching the circumference
3
Q
what is a rule about cyclic quadrilaterals?
A
opposite angles sum to 180 degrees
4
Q
what is the angle between a tangent and a radius?
A
90 degrees
