Use Pythagoras' theorem:- 82+32 = 73 and the square root of this is length of the diagonal which is about 8.544m to 3 decimal places
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(L + W) x 2 (8 + 3) x 2 = 11 x 2 = 22m
Perimeter is just twice the sum of length and width, in this case 2 x 11 m ie 22 m.
Perimeter = 33+33+3+3 = 72 m
The area of rectangle is : 12.0
Assuming that primeter is your way of spelling perimeterand rectangel is your way of spelling rectangle, the answer is 22 metres.