Chenda Bun, Kasey La, Ardia Sarao
– A set of points of equal
distance from the center.
Circumference – The perimeter of the
Diameter– A chord that passes
through the centre.
Radius – Half of the diameter.
Chord – A line segment that joins two
points on the circle.
Tangent - A straight line that touches
the circle at a single point.
Arc – Any part of a curve of a circle.
Major Arc – The larger arc.
Minor Arc – The smaller arc.
CentralAngle – An angle that has it’s
vertex at the center, two radii form the
arms of the angle
Inscribed Angle – An angle that has it’s
vertex on the circle and two chords form
Intercepted Arc - That part of a circle
that lies between two lines that intersect
Subtended – Closed off by an arc or line
Segment – A part of a line or curve
between two points.
Cyclic Quadrilateral - A quadrilateral
whose vertices all lie on a single circle.
The perpendicular line from the centre of a circle
to a chord bisects the chord.
Aninscribed angle is subtended by a diameter
than all the angles should equal to 90°
an inscribed angle and a central angle are
subtended by the same arc then the inscribed
angle is half the central angle.
perpendicular bisectors pass through the
center. Both are diameters of the circle.
Whentwo or more inscribed angles are
subtended by the same arc then all angles are the
two chords in a circle are parallel then they
share the same angles.
Iftwo tangents are drawn from a common point,
exterior to a circle then the length of the tangent
lines should be the same.
When two angles are opposite from each other in
a cyclic quadrilateral, then they should be
70° 84° <ABC + CDA = 180°
96° + 84° = 180°
<BCD + <DAC = 180°
110° + 70° = 180°
Whenan angle is formed between a tangent line
and a chord then it is equal to the inscribed angle
on the opposite side of the chord.
Aconvex polygon with n sides can be divided into
# OF TRIANGLES = n-2 SUM OF INTERIOR <‘s
# OF TRIANGLES = 5-2 = 180(n-2)
# OF TRIANGLES = 3 =180(5-2)
The sum of the interior angles of a polygon with
n sides = 180(n-2)
What is the distance from the centre of a circle
to a point on the circumference called?
What do you call a line that joins two points on
the circumference of a circle but does not pass
through the centre?