Integral

Do you know integral? Integral is very important to calculate a volume or area.
This is an example of calculation using integral

A ball is filled by water until 5/7 of height. Calculate the volume of ball if the radius of the ball is 7 cm














Okay. First step.
We would to divide this ball becoming 2 frustum. A and B













We know that volume A is 1/2 * 4/3 * phi * R^3
So volume A = 1/2 * 4/3 * 22/7 * 7 * 7 * 7
volume A = 718.67 cm3


For volume B, we will use integral
we know that x^2 + y^2 = r^2 (Pythagoras)


Volume B =









So total volume water is volume A + volume B = 856.67 cm3

Interesting place

Do you like travelling? If this question came to me, i would say yes i like travelling.
I have a dream to travel overseas.
In fact, I only go to domestic place in Indonesia.
I have a lot of experience to travel with my friends.
In some places, such as wonosari, i have gotted a lot of valuable experience.
Wonosari beach's is very beautiful. Good view from this beach always give me a sensational viewing. Wonosari have a lot of beautiful beach such as Sundak, Baron, Wediombo, Ngobaran, etc.





Another place which give me experience is located in magelang. Magelang is one of the city in Indonesia. Magelang have a wonderful tourism place as Borobudur temple. Borubudur must be saved for posterity. Borobudur temple as one of the wonders of the world. I recommend you to visit this place.















Another place is Semarang. Semarang is like Magelang. It is one of city in Indonesia. It is located in Central Java province. In Semarang, we can go to "Pecinan place". We can look a chinese tradition in here.

Friendship

There are a lot of way to express friendship.

Friendship is not only a word but it needs an action.

Frienship needs a process. It can't be formed instantly.