It is: 8*13 = 104 square feet
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An 8ft x 8ft rectangle is actually a square. The area is l x w = 8ft x 8ft = 64ft2.
13ft=3.96m 8ft=2.44m 3.96m by 2.44m = 9.66m2
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
The surface area of a sphere with a radius of 13ft is about 2,123.7ft2
Not so sure about squar metter (as the question appeared) but it is approx 9.7 sq metres.