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Contents
Parts of Circle
Area of Sector & Length of Arc
Surface Area of Cones & Pyramids
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Parts of Circles Definitions
It is in the centre of the circle and the distance from this point to any other point on the circumference is the same.
The distance from the centre to any point on the circle is called the radius. A diameter is twice the distance of a radius.
The
distance around a circle is its circumference. It is also the perimeter of the
circle
An
arc is a part of the circumference of a circle. The longer arc is called the
major arc while the shorter one is called the minor arc. A
chord is a straight line joining two points on the circumference. The longest
chord in a called a diameter. A
sector is a region enclosed by two radii and an arc. Refer to the figure given,
ROS is called the angle subtened by the arc RS at the centre O. The larger
sector is called the major sector while the smaller one, a minor sector. A
segment of a circle is the region enclosed by a chord and an arc of the circle.
The larger segment is the major segment while the smaller one, the minor
segment. A secant is a straight line cutting at two distinct point
If
a straight line and a circle have only one point of contact, then that line is
called a tangent. A tangent is always perpendicular to the to the radius drawn
to the point of contact. This property is abbreviated as tan ^
rad.
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Centre 
