Question

what is the surface area of a rectangular prism that has side lengths of 3 mm, 5 mm, 4 mm
A.60 mm
B.104 mm
C.94 mm
D.64 mm

Answer 1

@jagr2713 please help

Answer 2

c.

Answer 3

why is it C???

Answer 4

Well we use the formula

\[2(wl+hl+hw)\]

Answer 5

i just looked it up. 2x(3x5+3x4+4x5) = 94 sq mm

Answer 6

L=length
W=width
H=height

Answer 7

@Ashsmashum1290 do you know how to get the area of a rectangle?

Answer 8

yeah multiply then divide by 2

Answer 9

multiply? multiply times 265446464?

Answer 10

20

Answer 11

oh never mind i thought you said triangle not rectangle :)

Answer 12

ok.... so, that was one rectangle, a 5 x 4, yes
you'd multiply "the width times the height"

so let's see the prism now so to get the area of it
get the area of each of the rectangles in it, and sum them up