What is the surface area of a rectangular prism 3mm 4mm and 5 mm

94

Step-by-step explanation:

A=2 (wl+hl+hw) = 2· (4·3+5·3+5·4) = 94

Answer: 94

Step-by-step explanation:

3mm and 4mm and 5mm

This not the the traditional way but its pretty easy way to do it!

3 x 4 = 12

3 x 5 = 15

5 x 4 = 20

but before you add them up remember there are two of each so multiply all of them by 2

12 x 2 = 24

15 x 2 = 30

20 x 2 = 40

and now just add them up!

24 + 30 = 54

54 + 40 = 94

the reason i like this method is because all you have. to put on your paper is

12,15, 20

then you multiply by 2

and write 24, 30,40

and add them up! no weird formulas or any thing just simple logic