anonymous
  • anonymous
Please help. i thought i understood this but i don't.. find the surface area of these prisms
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
using this formula 2B=Ph
anonymous
  • anonymous
2B+Ph

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amistre64
  • amistre64
surface area is just the area of each side added together.
amistre64
  • amistre64
#32 = 2wl + 2wh + 2 lw
amistre64
  • amistre64
l=7; w=8; and h=12
anonymous
  • anonymous
so 2*8*7+2*8*12+2*7*8?
amistre64
  • amistre64
or 2(base area) + (base perimeter)(height) would work
amistre64
  • amistre64
2(7)(8) + 2(7)(12) + 2(8)(12)...yeah
anonymous
  • anonymous
so 472ft sq
amistre64
  • amistre64
472 is surface are for #32
amistre64
  • amistre64
the top and bottom are closed in right?
anonymous
  • anonymous
ya
amistre64
  • amistre64
#37 is the same reasoning 2(8)(5) + 2(8)(12) + 2(5)(12)
amistre64
  • amistre64
392 = surface area for #37
amistre64
  • amistre64
#33 is an equal sided triangle with sides = to 5; it length is equal to 8
amistre64
  • amistre64
3(5)(8) equals the surface are for the long sides
amistre64
  • amistre64
the surface are for 2 triangle faces is: (5)(5)sin(60)
amistre64
  • amistre64
21.65 + 120 = 141.65
anonymous
  • anonymous
ok thank you
amistre64
  • amistre64
finding the triangle face area by just the sides is tricky...but if you know the formula for the area of a triangle with 2 sides and an angle inbetween them, its easier :)
anonymous
  • anonymous
ok

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