Area = π × r2. Or, when you know the Diameter: A = (π/4) × D2. So A = 6π, which is 18.85. So A = 18.85. And here's the hand.
I don't think you use a fraction. You multiply .6666 by 72 which equals 47.9952 or rounded 48. :)
(6-8)/(1+2)= -2/3 the answer to the question
17 + 23 = 40
The temperature rose 40 degrees.