Encyclopedia of area formula; Encyclopedia of mathematical area calculation formula.

1, rectangular area = length × width.

2. Area of a square = side length × side length.

3. Area of triangle = base × height ÷2.

4. The area of parallelogram = base × height.

5. Trapezoidal area = (upper bottom+lower bottom) × height ÷2.

6. Area of circle = π× radius× radius.

7. Surface area of cube = side length × side length ×6.

8. lateral area of cylinder = perimeter of bottom circle × height.

9. Surface area of cylinder = area of upper and lower bottom surfaces+area of side surfaces.

10, sector area formula: area = (n * π * r 2)/360 = l * r/2.