Date post: | 21-Jan-2016 |
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CIRCLESSUBMITTED BY ROSHNI B S
Circle is a closed curve in a plane
A circle can be drawn with the help of a circular object.
Circle and Centre of a circle A circle is a closed
curve consisting of all points in a plane
which are at the same distance from a fixed point inside it. This fixed point is
called the Centre of the circleA circle has only and only one centre
Circumference
The distance around a circle is called its Circumference
Radius
A line segment joins that any point on the circle to its centre is called a radius
Radii of a circle are equal in lengthInfinite number of radius can be drawn in a
circle
Diameter
A line segment that joins any two points on the circle and passes through its centre is called Diameter
Infinite number of diameters can be drawn in a circle
As the radii of a circle are equal in length , its diameters too are equal in length
Chord
A line segment that joins any two points on the circle is called a Chord
Diameter is also a chord of the circle
The diameter is the longest chord Infinite number of chords can be drawn in a
circle
r - represents the radius of the circle, AB is the chord of the circle, d is the distance between the centre and chord
Then, formula for length of chord is, = 2√(r^2-d^2)