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anonymous

  • 5 years ago

Can Someone Please Help Me with some Geometry??

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  1. anonymous
    • 5 years ago
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    For these 3 pictures.. i need to find the surface area

  2. anonymous
    • 5 years ago
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    the first one is composed of 2 triangles: 4x5 + 4x5 = 40m 3 rectangles: 4x14 + 5x14 + \[14\times \sqrt{4^{2} + 5^{2}}\] and you add all of them up

  3. anonymous
    • 5 years ago
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    so the first one would be 89.64?

  4. radar
    • 5 years ago
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    Area of triangle is BH/2, in this figure that equals (4 x 5)/2=20/2=10 sq M, but their are two so the surface area of the triangular portion would be 20 sq meter.

  5. anonymous
    • 5 years ago
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    for the first one i got 2(20)+Ph.. i need to find out what the perimeter is

  6. radar
    • 5 years ago
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    The suface of the sides are as indicated by tacolover. 5x14= 70 sq M for one side. 4x14=56 sqM for another side and 14 x sq rt(16+25) \[\sqrt{41}\times14\]

  7. anonymous
    • 5 years ago
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    im totally lost... the formula i have to use is 2B+Ph

  8. radar
    • 5 years ago
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    Final answer is: 10+10+70+56+89.6=235sq M

  9. anonymous
    • 5 years ago
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    so that would be for the first one?

  10. radar
    • 5 years ago
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    That will work too

  11. radar
    • 5 years ago
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    yes as long as you remember that the B is a triangle and their are two of them.

  12. radar
    • 5 years ago
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    P is perimeter and you must user all three sides.

  13. radar
    • 5 years ago
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    You want to look at the next figure?

  14. anonymous
    • 5 years ago
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    yeah.. so far for the next one i got 2(28)+Ph

  15. radar
    • 5 years ago
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    It is a cylinder or like a can. Too find the total surface area you calculate the area of the ends which are circles (don't forget their are two of them. Then the body is actually a rectangle which has one side equal to the circumference of the circle times the height.

  16. radar
    • 5 years ago
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    Do you agree?

  17. anonymous
    • 5 years ago
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    yeah.. sorry for some reason i put up the wrong picture.. but i need help with that one to

  18. anonymous
    • 5 years ago
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    so id use 2*pi*r^2+2*pi*r*h

  19. radar
    • 5 years ago
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    Do you know how calculate the area of circle whose diameter is 8cm or radius would be 1/2 of that or 4 cm.??

  20. radar
    • 5 years ago
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    The area of the ends would be as you have but it would be like 2(2*pi*r^2). Then the can (not the ends) would be h*C 8*piD=8*pi*8

  21. radar
    • 5 years ago
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    I am sorry I got the area wrong for the ends. The formula is pi*r^2 so the ends would be 2(pi*r^2) that is for both ends

  22. anonymous
    • 5 years ago
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    so for r would it be half the diameter (8).. so 2(3.14*4^2)

  23. radar
    • 5 years ago
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    Yes that gives you the area for the ends of the cylinder. both

  24. anonymous
    • 5 years ago
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    so 100.48

  25. radar
    • 5 years ago
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    Let me check yes for the ends. Now this must be added to the surface area of the body of the can pi*D*h

  26. anonymous
    • 5 years ago
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    so 3.14*8*12=301.44

  27. radar
    • 5 years ago
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    Right now add the end area to your 301.44

  28. anonymous
    • 5 years ago
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    than i would add 100.48+301.44=401.92

  29. radar
    • 5 years ago
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    Yes that would give you the total surface area of the can, I forgot that the heigth was 12 and put 8 but you caught it!

  30. radar
    • 5 years ago
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    and that is in sq cm

  31. anonymous
    • 5 years ago
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    okay

  32. radar
    • 5 years ago
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    Do you need any help on the 3rd figure.

  33. anonymous
    • 5 years ago
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    no but will you check this one for me

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  34. anonymous
    • 5 years ago
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    i got 326.25m^2

  35. radar
    • 5 years ago
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    Does it have a bottom and a top? It is hard to tell from the drawing!

  36. anonymous
    • 5 years ago
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    yea

  37. radar
    • 5 years ago
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    I used calculator and got 326.73, so I would say you used the correct procedure and don't forget what the units are.......sq M

  38. anonymous
    • 5 years ago
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    ok thank you

  39. anonymous
    • 5 years ago
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    can you also check this one.. i got 254.34 ft^2

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  40. radar
    • 5 years ago
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    I agree with your answer of 254.34 sq ft.

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