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A 9 x 12 rectangle has a diagonal of 15.
The diagonal multiplied by sin(angle) gives one side of the rectangle and the diagonal times cos(theta) gives the other. So the area is (diagonal)2 x cos(theta) x sin(theta).
sqrt 3200 =sqrt 100 x sqrt 16 x sqrt 2 = 40 root 2 = approx 56.5
53.85164807' by means of Pythagoras.
A rectangle doesn't have a hypotenuse.The diagonal of this one is sqrt(6,100) = 78.1025 (rounded)