PARTS OF A CIRCLE
CIRCLE:
*A closed curve joined from one point inside it called the center and it is
named by the point in the center.
*The word “circle” comes from the Latin word “circulus” which means
disc.
RADIUS:
*Is the line joining center to a point in the circle.
CHORD:
*Is a line joining two points on the circle.
DIAMETER:
*Is double the radius it joins two points passing through
the circle.
TANGENT:
*Straight line touching the circle(from outside)
SECTOR:
*A part of the sector having two lines of radius (r+r)
Circumference/ perimeter = π x d
Area = π r²
What is the pi?
Is the ratio of the circumference of any circle to the diameter of that circle.
Is the pi infinite?
Yes
How did people know that pi is infinite?
Because after the decimal point, the digits go on forever and ever.
Did you celebrate the international pi day?
It's been an official national holiday since 2009. March
14 marks Pi Day, an annual celebration of the
mathematical sign pi. Founded in 1988 by physicist Larry
Shaw, March 14 was selected because the numerical
date (3.14) represents the first three digits of pi, and it
also happens to be Albert Einstein's birthday