circle theorem flashcards (copy)

theorem 1

angles in the same segment are equal

theorem 2

the angle at the centre is twice the angle at circumference

theorem 3

opposite angles in a cyclic quadrilateral add to 180 degrees

theorem 4

alternate segment theorem

theorem 5

the angle in a semi circle is a right angle

theorem 6

the tangents to a circle is perpendicular to the radius

theorem 7

two tangents to a circle from a point are equal

theorem 8

the perpendicular from the centre to the chord bisects the chord