Monday, May 14, 2007

This space is for those who are fascinated by MATHS ,try their hands on it but end up getting confused because of non-clarity of concepts.

The chapter i am going to start with is CIRCUMFERENCE AND AREA OF CIRCLES.....

Prerequisite knowledge : Take a fixed point on the plane and mark it as O . Take a fixed distance mark it as 'R' . Keeping the end at O fixed and moving the other end of 'R' , the figure thus obtained is a circle .
All the points of this figure are at equal distance from O .(all the points in colour blue)
O-is called the centre of the circle .
R-is the radius of the circle .
Circles around us: Bangle , Rim of a cellotape .
Rim of a wheel.
Circumference (or perimeter) of the circle:is the measure of the boundary of the circle.

Lets do an activity to find circumference of certain circular figures....
  1. Bangle:mark a point at the boundary of the bangle . Take a thread and start wrapping it around the boundary starting from the marked point . Continue till you reach the marked point again , cut out the wrapped up piece of thread .

Measure this length of the thread using a ruler.

This length of the thread wich measures the boundary of the bangle is the circumference of the given bangle.