Area math

Zanydrago:

1]
You have a box, with the length on 1, 2 and 3 cm.
high: 1
wide: 2
Length: 3

Is there a question here?

2]
You have a cake with a diameter on [color=#0000FF]21 cm and it's 10 cm high. You have 21 students.[/color]

a) How many degrees does every student get?
360 degrees / 21 students => 17 degrees, 8 minutes and 34 seconds to the nearest second.

b) What is the length on the piece of circle? I think that you mean what is the length of each arc.
The circumference is 2*pi*r so it you divide this into 21 pieces. How long do you think each arc is?

c) What is the area on every piece of cake in cm^2?
The area of a circle is pi*r², you are dividing this circle into 21 pieces, you can do that.

d)What is the area on every piece of cake in m^2?
Well, there are 100cm in a metre. So there must be 100² cm² in a m²
Obviously there are going to be a lot less m² than cm² so how do you think that you will get the answer?