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$Old$ 08-27-2008, 02:05 AM

devi $devi is offline$

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How many sq.cm of construction paper does one need in order to exactly cover, with no overlap, 5sides of a cube with edges that are 12 cms long.

(a) $60 cm^2$
(b) $144 cm^2$
(c) $300 cm^2$
(d) $720 cm^2$

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$Old$ 08-27-2008, 04:03 AM

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Originally Posted by devi $View Post$

How many sq.cm of construction paper does one need in order to exactly cover, with no overlap, 5sides of a cube with edges that are 12 cms long.

(a) $60 cm^2$
(b) $144 cm^2$
(c) $300 cm^2$
(d) $720 cm^2$

A cube is made of 6 sides, which form is a square.

What is the area of a square with a side of length 12 ? Answer
So if you need to cover 5 sides of it, what will it be ?

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$\int \limits_{0}^{+\infty} {\cos\left(t^2\right) \ dt}=\sqrt{\frac{\pi}{8}} \quad \text{ and } \quad \int \limits_{-\infty}^{+\infty} {e^{-t^2} \cdot \cos( \alpha t) \ dt}=\sqrt{\pi} \cdot e^{-\alpha^2/4}$

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