For common shapes - circles, regular polygons, trapezoids, kites, etc. - we have various "formulas" for calculating areas and perimeters.
For other "odd" shapes, we would have to use calculus or numerical approximation methods (such as partitioning the shape into rectangles having small widths and summing all their areas).
For common shapes - circles, regular polygons, trapezoids, kites, etc. - we have various "formulas" for calculating areas and perimeters.
For other "odd" shapes, we would have to use calculus or numerical approximation methods (such as partitioning the shape into rectangles having small widths and summing all their areas).