Rectangular or square:
The area of a rectangle can be obtained by the product of width (w) and height (h), that is, area = w× h.
A square is a special rectangle, all its sides are equal. Therefore, the area of a square can be simplified as the square of the side length (L), that is, the area = L^2.
Triangle:
-The area of a triangle can be calculated by dividing the product of the base (b) and the height (h) by 2, that is, the area = (B × H)/2.
-You can also use Helen's formula to calculate the area of a triangle with any shape, which requires knowing the length of three sides of the triangle.
Round:
-The area of a circle can be calculated by multiplying the square of the radius (r) by π, that is, the area = pi× r 2.
Other complex shapes:
-For other complex polygonal or curved shapes, you can use calculus to calculate the area. For example, you can use definite integral to calculate the area between the curve and the coordinate axis.
It should be noted that different shapes have different calculation methods, and the specific calculation process may be slightly different. When applying these methods, please make sure to use the correct formula and accurate parameter values.