The area of the upper half of the circle whose equation is $$(x-1)^2+y^2=1$$ is given by

The area bounded by the curve $$y^2=4 a^2(x-1)$$ and the lines $$x=1, y=4 a$$ is

The area enclosed by the pair of lines $$xy=0$$, the line $$x-4=0$$ and $$y+5=0$$ is

The area bounded by the curve $$x=4-y^2$$ and the Y-axis is