The area of a square is calculated by squaring the length of one of its sides. In this case, the side length is 8 cm, so the area would be 8 cm x 8 cm = 64 square cm.
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If that means (2 times 4) then the area of the square is 8*8 = 64 square cm
If the square has sides of 8 meters then its area is 8*8 = 64 square meters
area = 8*5 = 40 square cm
The answer is 32. What you do is take the square root of 64, which is 8. Because it is a square all the sides are equal. Then, you multiply 8 by 4 because there are four sides.
Perimeter: 8+15+17 = 40 cm Area: 0.5*8*15 = 60 square cm