Surface Area Formula:
A= 2 ( lw + lh + wh )
l = length
w = width
h = height
Step 1.) plug in what you know
A = 2 ( lw + l 22 + w 22 )
Step 2.) find the length & width
- look at the area.
- a rectangles area is made up of the length and width being multiplied together.
- by saying this, I’m going to estimate how much the length and width would be, and make sure they will add up to 22 when multiplied.
- so, I’m going to say that the length is 11, and the width is 2.
Step 3.) plug in everything and then solve
A= 2 (11•2) + (11•22) + (2•22)
To solve, you are going to first multiple everything in parentheses like so:
A= 2 (22) + (242) + (44)
And then you are going to multiply everything by the 2 like so:
A= (44) + (484) + (88)
And then you are going to combine them all together (by adding) and get:
A= 616
and that is your answer.
