The area of the region bounded by the circle x²+y²=1 is __________sq. units.

Find the area bounded by the curve $$y=x^2+x+4$$​, the x-axis and the ordinates x = 1 and x = 3.

The area of the region enclosed between $$y^2 = 4x \quad \text{and} \quad x = 1 \quad \text{and} \quad x = 3.$$ in the first quadrant is: