where a small circle lies inside the bigger one. the point o is the centre of both circles. the shaded coloured area, between the boundary of these two circles, is known as an annulus. the smaller circle is known as the inner circle, while the bigger circle is termed as the outer circ...
A region in the Cartesian plane can be regular (triangles, circles) or it can be delimited by curves. In the case that the region is delimited by curves, the area can be calculated by applying a definite integral which is evaluated by the fundamental t...
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