+0  
 
0
688
4
avatar+644 

Eight cubes form the figure shown. The side length of each cube is 3 cm. How many square centimeters are in the surface area of the figure?

waffles  Apr 28, 2017
 #1
avatar+7026 
0

The surface area of this thing is just a 3 x 3 x 1 box surface area minus 2 faces because there are still squares in the hole.

Surface area 

= (3 x 3) x (3 x 3) x 2 + 3 x (3 x 3) x 4 - 2 x 3 x 3

= 252 square centimeters

MaxWong  Apr 28, 2017
 #2
avatar+644 
0

i dont think this is the right answer

waffles  Apr 28, 2017
 #3
avatar+7339 
+1

Let's just count how many cube faces are exposed..

 

8 on the front, 8 on the back

3 on the left side, 3 on the right side

3 on the top, 3 on the bottom

4 in the middle

 

That is a total of 8 + 8 + 3 + 3 + 3 + 3 + 4 = 32 exposed cube faces.

Each cube face has an area of 3 cm * 3 cm = 9 cm2

So.. the total surface area of this shape = 32 * 9 = 288 cm2

 

It's a  3 x 3 x 1 box SA minus 2 faces PLUS 4 faces.

hectictar  Apr 28, 2017
 #4
avatar+75 
0

That sounds right

Bshirel  Apr 28, 2017

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