Question

Find the height of a rectangular prism if the surface area is 148 cm2, the width is 4 cm and the length is 5 cm.

Answer 1

is that supposed to be 148cm^3? it's a three-dimensional object right?

Answer 2

If so, 148
----- = height
(4*5)

Answer 3

No. it's 148 cm2

Answer 4

@ehuman >>surface area is 148 cm2 AREA is expressed in square units.

Answer 5

oh well now that i pay attention when i read it

Answer 6

SA of a rectangular solid is the perimeter of a base times the height of the solid PLUS the sum of the areas of the two rectangular bases.

SA = p*h + 2+B where B is the area of a rectangular base.

148 = (5 + 5 + 4 + 4)*h + 2*(4*5)

@dopegyal_ h = ?

Answer 7

6?

Answer 8

148cm^2 surface area.
subtract 20cm for top and 20cm for bottom
108cm left for height, 18 liner cm around prism
108/18 for height

Answer 9

But direct's looks more fancy

Answer 10

6 it s

Answer 11

Not all that fancy.

Think about a stack of circles, kinda like the toy Slinky.

Each circle has circumference 2 pi r and the stack is h tall. So 2 pi r h gives the lateral area.

Then, add on the two circular bases. That's the only way I can remember the formula.

@ehuman

Answer 12

I love learning