We can see the circle in every where;
the clock, the wheels, the children toys, the engine, ..
can you imagine the world without the circle!
off course no cars can work, no engines, no clocks, no bycicles, no rings, ....
I think the world may stop!!!!!!
we use this shape in all sides of life
in Home, School, Work, Bus, Car.
Puzzles & Brain Teasers:
A number of children are standing in a circle. They are evenly spaced and the 5th child is directly opposite the 19th child. How many children are there altogether?
the wright answer is below at the end of the post
A number of children are standing in a circle. They are evenly spaced and the 5th child is directly opposite the 19th child. How many children are there altogether?
the wright answer is below at the end of the post
let's see how can we messure the circumference and the area of the circle:
circumference-to-diameter ratio for a circle is constant as the size of the circle is changed (as it must be since scaling a plane figure by a factor increases its perimeter by ), and also scales by . This ratio is denoted (pi), and has been proved transcendental. 
Knowing , the area of the circle can be computed either geometrically or using calculus. As the number of concentric strips increases to infinity as illustrated above, they form a triangle, so
This derivation was first recorded by Archimedes in Measurement of a Circle (ca. 225 BC).
If the circle is instead cut into wedges, as the number of wedges increases to infinity, a rectangle results, so
the answer of the puzzle is 22
No comments:
Post a Comment