Question

Please help. i thought i understood this but i don't.. find the surface area of these prisms

Answer 1

using this formula 2B=Ph

Answer 2

2B+Ph

Answer 3

surface area is just the area of each side added together.

Answer 4

#32 = 2wl + 2wh + 2 lw

Answer 5

l=7; w=8; and h=12

Answer 6

so 2*8*7+2*8*12+2*7*8?

Answer 7

or 2(base area) + (base perimeter)(height) would work

Answer 8

2(7)(8) + 2(7)(12) + 2(8)(12)...yeah

Answer 9

so 472ft sq

Answer 10

472 is surface are for #32

Answer 11

the top and bottom are closed in right?

Answer 12

ya

Answer 13

#37 is the same reasoning

2(8)(5) + 2(8)(12) + 2(5)(12)

Answer 14

392 = surface area for #37

Answer 15

#33 is an equal sided triangle with sides = to 5; it length is equal to 8

Answer 16

3(5)(8) equals the surface are for the long sides

Answer 17

the surface are for 2 triangle faces is:

(5)(5)sin(60)

Answer 18

21.65 + 120 = 141.65

Answer 19

ok thank you

Answer 20

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 :)

Answer 21

ok