What is the formula?

Question

What is the formula for the surface area of a rectangle?
Ill give ten points to the person that tries their best and explains it to me....

Answer 1

Not sure if you mean a rectangle or a rectangular prism. For a rectangle, you multiply the length by the width to get the area.

For a rectangular prism it's a bit more complicated. The formula is 2lw + 2wh + 2lh, where l, h and w are the length, width and height respectively. That's the formula because the surface of a rectangular prism is made up of six rectangles--four sides, a top and a bottom. The top and bottom each have an area of lw, two of the sides each have an area of hw, and the other two have areas of lh.

Answer 2

Surface area refers to a three (or more) dimensional shapes whereas rectangle is a two-dimensional shape. If you mean rectangular box/prism, it is the area of all the faces, inside and outside, as the case may be. If you want only external surface area, it is 2(lb + bh +hl), and if internal and expternal both are required (like in the case of a hollow box), it will be double of this i.e. 4(lb + bh + hl), the thickness being assumed as negligible. There are so many such models..... with some thickness (internal and external dimensions different), with or without lid/bottom, etc.

If you mean only rectangle, it should be refered as area which is given by l x b sq.units

Answer 3

Area of a rectangle is length times width: A=lw.
Since you said surface area, I'm guessing that you mean a rectangular prism, also known as a rectangular solid. Basically, shaped like a box.

There are 6 faces on such a solids. Opposite faces are equal. The 3 dimensions are length, width & hight. these rectangles have areas that are the products of 2 of the dimensions.
area= 2*length*width+2*length*hight+2*width*length or
A=2(lw+lh+wh)

Answer 4

Are you referring to the area or the surface area?
Area is defined as the length * the width and tells you how many square units of space the 2-d object occupies
Surface area on the other had is for 3-d objects and is for telling you
how many square unit of space each o fthe different sides occupies.
The formula for this would be the length * the width of each side added all together. You should have a total of 6 numbers to add together.
Hope that answers your question...

Answer 5

a rectangle is two-dimensional, not three-dimensional. It does not have a surface, it has an area. The area of a rectangle, of course, is the length times the width. Now if you mean a three-dimensional object that is indefinitely thin, then the surface has two sides, which has area twice the length times the width.

S.A. = 2LW

Answer 6

Surface area of a Rectangle Box

A rectangle box is three dimensional

Let

W= width

L = length

H = height

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The formula

Surface area = 2(LW) + 2(WH) + 2(LH)

Click on the URL below for additional information concerning surface area.

www.math.unt.edu/mathlab/emathlab/Surface Area.htm


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Answer 7

HI MY NAME IS YOLANDA;
TO FIND THE SURFACE AREA OF A RECTANGEL,
YOU MEASURE THE LENGTH OF THE RECTANGLE AND THEN MEASURE THE WIDTH OF THE RECTANGLE-
AFTER DOING SO MULTIPLE THE LENGTH AND THE WIDTH( ALSO KNOWN AS THE BREATH)
THE ANSER YOU GET WILL BE IN SQ
EG
THE LENGHT OF A DEAK IS 10 INCHES LONG AND THE BREATH IS 6 INCHES WIDE- FIND THE AREA OF THE DEAK?
A = LB
L=10''
B=6''
A=60 INCHES SQUARED

I HOPE THIS HELPS- GOOD LUCK!

ALSO NOTE THERE IS A DIFFRENCE BETWEEN SURFACE AREA AND TOTAL SURFACE AREA,WHICH IS THE SUM OF THE AREA OF ALL THE FACES OF THE OBJECT YOU MEASURES.
EG YOU HAVE A SHOE BOX ,COUNT THE FACES (ALL) MEASURE EACH FACES' LENGHTS ANDD BREATHS ,FIND THE AREA FOR EACH FACE AND ADD THEM ALL TOGETHER!

Answer 8

your question doesnt make sense
by surface area, u mean something that is 3d but u said rectangle... which is 2d

so the formula depends on which planet u are on

Answer 9

SA of Rectangle = length x width
If you're talking about SA of a rectangular box
2 ( length x width) + 2 (length x height) + 2 (height x width).

Answer 10

Is this your homework?
This is very basic and you should have not asked about it.
But, that is o.k.

Area of a rectangle is width * height
A = w*h