An 8ft x 8ft rectangle is actually a square. The area is l x w = 8ft x 8ft = 64ft2.
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It is: 8*13 = 104 square feet
The dimensions given are not that of a rectangle but are probably that of an isosceles trapezoid in which case it is:- Area = 0.5*(8+10)*2 = 18 square feet
8ft*5ft = 40 sqft = 3.716 sq metres (to 3 dp).
To find the area of a rectangle, you multiply the length by the width. In this case, 6ft x 8ft equals 48 square feet. This is because you are essentially calculating the space within the rectangle, which is measured in square units.
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.