How to Get the Area of Circle

Actually we know that the area of circle is . . . .

But, do you know where it come from?

So, now I will discus how to get the area of a circle.
The area of circle can be formed by some approachments (pendekatan):
1. Circle area with approachment of rectangle area.
2. Circle area with approachment of parallelogram area.
3. Circle area with approachment of triangle area.
4. Circle area with approachment of trapezium area.
5. Circle area with approachment of rhombus area.

For the first, Circle Area with Approachment of Rhombus Area.
Here the video about it.

For the others, I will try to update next time ^_^.

Study never has ending . . . .^^