Circles

 CIRCLES

Our association with circles begin with seeing circles in nature when we observe Sun or Moon. The first few years of our childhood are given to playing with various types of balls, that again are all circles. Even the wheels of the bicycle are circles. So we are quite familiar with circles. On a lighter note when we are not able to answer a question in the exam, we get a circular figure, Zero as marks. That's also a circle.

Circles are geometric figures with eccentricity zero and both its foci, coincident. Any point drawn on the line of the circle is equidistant from the center. This distance is also called the radius. The line that divides the circle in two equal halves is called the diameter. The distance around the line of the circle is called the circumference which is the perimeter of the circle.

Centre: the midpoint of a circle

Radius: the line connecting centre and any point on the circle itself

Diameter: the line dividing the circle in two equal halves

Chord: the line whose endpoints lie on the circle

Secant: the line cutting the circle at two points also called as extended chord

Tangent: the coplanar line touching the circle at a single point

We learnt the fundamentals of circle. More to come in.