If 12.42 ft has been rounded to 2 decimal places then it is a right ange triangle
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If it's a right angle triangle then its hypotenuse is 10ft and its sides are 6ft and 8ft
An 8ft x 8ft rectangle is actually a square. The area is l x w = 8ft x 8ft = 64ft2.
It depends on the shape. A 8ft-3ft-3ft triangle is impossible, a circle needs only one measure, a square only 1, a rectangle 2. Other quadrilaterals need more than 3. So the shape is indeterminate and, therefore, it is impossible to calculate the area.
13ft=3.96m 8ft=2.44m 3.96m by 2.44m = 9.66m2
Well, honey, an 8ft by 8ft square gives you a total of 64 square feet. It's as simple as multiplying the length by the width. So, if you're looking to cover that space with some fancy carpet, you'll need 64 square feet of it.