anonymous one year ago composite figures

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1. anonymous

2. anonymous

need help!!!!

3. anonymous

think of it like a rectangular prism. the surface area formula is "2ab + 2bc + 2ac" http://www.math.com/tables/geometry/surfareas.htm

4. anonymous

is it 2400?

5. anonymous

is that right?

6. anonymous

try again. the width would be "a", the length would be "b", and the height would be "c". try adding up all of the "5"s and using that for the height. then use "12" for the length, and "10" for the width

7. geerky42

"Find the surface area of the $$\small \textbf{VISIBLE}$$ sides of the boxes" |dw:1435203341959:dw| Just add up the area of these three rectangles.

8. anonymous

ohhh you're so right! I thought by "visible sides" it meant not to consider the sides of the boxes that would be facing each other when stacked. "geerky42" explained it so well and precise. thank you.

9. geerky42

Base is not included, so you only need to calculate these two rectangles.

10. geerky42

|dw:1435203679087:dw|

11. geerky42

Can you do that? @hinarauf80

12. geerky42

It's just $$12\times20 ~+~10\times20$$

13. anonymous

sorry i couldnt repond i have a baby she on the floor anyway thanks

14. anonymous

i mean sitting on the floor*

15. anonymous

its 240+200= 440

16. anonymous

but its wrong

17. geerky42

It's not our fault (nor your) that question is ambiguous... Try to add area of third rectangle.