TRIGONOMETRY/GEOMETRY

1. PARTS OF
A CIRCLE
Prepared by: Ms. Jenny Tuazon

2. Circle
The set of all points
which are at a fixed
distance from a given
point in the plane.
*Plane – flat surface
with no thickness
Center
The center is
used to name
the circle.

3. Radius
The fixed
distance of the
points from
center.

4. Chord
It is a
segment
whose
endpoints
are on the
circle

5. Diameter
Twice the
length of the
radius

6. Arc
A continuous
part of the
curved line
forming a
circle
Major Arc - longer than the
semicircle
Minor Arc – Shorter than the
semicircle

7. Semicircle – arc which evenly divides a circle into 2
Circumference – the distance around the entire
circle
Secant line – it passes the circle in two points
Tangent line – It passes the circle in one point
Central Angle – an angle whose vertex is the
center of the circle
Inscribed angle – point that lies on the circle and
it’s sides contains chords