ErinWeeks
  • ErinWeeks
Find the surface area of the figure to the nearest whole number. PLEASE HELPPPP
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ErinWeeks
  • ErinWeeks
A. 310 ft2 B. 158 ft2 C. 135 ft2 D. 74 ft2 I thought it was C but it was wrong -_-
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anonymous
  • anonymous
the back side in the image is very confusing :/
ErinWeeks
  • ErinWeeks
its 2.5 and 3.3

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More answers

anonymous
  • anonymous
hint: split it into two objects. find the surface area of the top triangle pyramid and add it to the surface area of the square prism
ErinWeeks
  • ErinWeeks
im still confused
anonymous
  • anonymous
but you understand what I said?
ErinWeeks
  • ErinWeeks
i dont really -_-
anonymous
  • anonymous
k wait, let me work through the whole thing first then I'll explain it to you.
ErinWeeks
  • ErinWeeks
okay thank you
anonymous
  • anonymous
|dw:1357770316535:dw| see I split the two? this is what I meant and excuse my drawing. Note: we do not need to find the bottom base of the pyramid and top of the square prism, as it is not accounted towards the total surface area. (It's the part where they are glued together if you may).
anonymous
  • anonymous
well i can to see 2 solids... the piramid and the cube.. so the piramid area is \[\frac{ 1 }{ 2 }* perimetre*face length\]. in your piramid \[\frac{ 1 }{ 2 } \times 18\times 3.3 \] and the cube surface
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ErinWeeks
  • ErinWeeks
for the second formula i got 29.7 ... i dont know how to do the 1st one
anonymous
  • anonymous
yes 29.7 is right for the top(pyramid).
ErinWeeks
  • ErinWeeks
okay now can you explain how to do the bottom
anonymous
  • anonymous
for the bottom(square prism) it is even easier. 2(4.5 x 6 + 4.5 x 6) + (4.5 x 4.5)
anonymous
  • anonymous
this is because the top of the square prism(where it needs to be used to be stuck against the bottom part of the pyramid) is not accounted for.
ErinWeeks
  • ErinWeeks
i got 74.25 now what ??
anonymous
  • anonymous
add them together.
anonymous
  • anonymous
to get your final answer.
ErinWeeks
  • ErinWeeks
i got 103.95 but thats not a choice
anonymous
  • anonymous
your 74.25 you got is wrong, try again.
anonymous
  • anonymous
it should be 128.25
anonymous
  • anonymous
no, it is \[4(4.5*6)+ 2(4.5*4.5)\]
ErinWeeks
  • ErinWeeks
with @ankolix formula i got 142.5
anonymous
  • anonymous
@ankolix I don't think you understand the concept that you only need 4.5 x 4.5 once not twice.
ErinWeeks
  • ErinWeeks
@JayDS my answer and your answer are both not an option
anonymous
  • anonymous
yeah.. ivemistake
anonymous
  • anonymous
please tell me the options.
ErinWeeks
  • ErinWeeks
A. 310 ft2 B. 158 ft2 C. 135 ft2 D. 74 ft2
anonymous
  • anonymous
and you made a calculation error before, so please be careful when entering it in the calculator.
anonymous
  • anonymous
is 4(4.5*6)+(4.5*4.5)+29.7=157.95.. option B
anonymous
  • anonymous
yep, option B.
anonymous
  • anonymous
using my calculation you will get 157.95. and why is it not exact? because probably when they calculated they used more decimal places which resulted them to get a more accurate answer but we have been only given that, so we just those figures in the picture.
anonymous
  • anonymous
medal for gratitude ;)
ErinWeeks
  • ErinWeeks
okay thank you so muchh..
anonymous
  • anonymous
@ankolix, I would like to say you deserve the medal for trying but you have copied off me but good job.

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