The area of the region bounded by the curve y = x + 1 and the lines x = 2 and x = 3 is

The area of the region bounded by the curve y = sin x between the ordinates x = 0, x = π/2 and the x-axis is

The area of the region bounded by the ellipse is

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

The area of the region bounded by the curve x = 2y + 3 and the y lines. y = 1 and y = –1 is