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Circle Theriums (10 (internal intersection, AE x EB = CE x ED, 10), 11…
Circle Theriums
10
internal intersection
AE x EB = CE x ED
11
External Intersection
AE x BE = CE x DE
1
A
Tangent
and a
Radius
meet at 90*
2
Tangents
from the same point are the
same length
3
the
perpendicular bisector
of a
chord
passes through the centre of the circle
4
Two Radii
form and
isosceles triangle
5
The angle at the
centre
of the circle is
twice
the angle at the
circumference
6
The angle in a
semicircle
is
90*
7
Angles in the
same segment
are
equal
8
opposite angles
in a
cyclic quadrilateral
add up to 180*
9
alternative segment theorem
