The area bounded within x2+y2=1x^2+y^2=1x2+y2=1 and above y=−x+1y=-x+1y=−x+1 is: Aπ2\dfrac\pi22π;B2+π4\sqrt2+\dfrac\pi42+4π;C2\sqrt22;Dπ4−12\dfrac\pi4-\dfrac124π−21;E1−π41-\dfrac\pi41−4π;F3π4+12\dfrac{3\pi}4+\dfrac1243π+21.