I bought a macbook pro retina 13" few days ago. I have never had a mac before and I don't know where can I set the computer to keep running when I close the display.

The laptop came with os x 10.8.4.

Any help?


Question: The $ABCD$ paralelograms sides are $AB,BC,CD,DA$. On these line segments there are points in the same order: $X,Y,Z,V$.
Answer: Due triangle similarity (by drawing parallel lines) at a given fraction of sides it is square root of the ratio. If at mid point of each side quarter area is filled for central position example $ \sqrt{(1/4)} = 1/2$. In this case the fraction is:

$ \sqrt{.86} =~ .927362.$

or =~ $ (1- 0.927362) $ if you mean the other half side for the ratio.