One side of a square is 10 units. which is greater, the number of square units for the área of the square or the number of units for the perimeter? explain

The area of the square would be greater. To get the area of a square you need to multiply the length and width of the square, therefore you would multiply 10x10 which comes out to be 100. The perimeter would only be 40.

Well since we know that a square has the same length all around and they gave us 10 lets use that:)
So in order to find area we need to multiply length times width sooo
Area = length x width 
since we already know that the width and length are both 10 lets plug them in
10 x 10 = 100
so our area for our square is 100units²
now lets put that aside for now.. and work on our perimeter 
so heres a picture of what our square would look like 
 
     10
     |                   |
10 |                   | 10
     |                   |
     
              10 
The formula for perimeter is all of the sides added up so lets do that:)
10 + 10 + 10 + 10 = 40!
so our perimeter for this square is 40units 
now lets compare our two totals

area = 100units²
perimeter = 40units 
which one is bigger?
and of course area is bigger!
and finally lets answer your question:
area is bigger because after finding the totals, area equaled 100units² while the perimeter was only 40 units. 
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