The area formula of rectangle: the area of rectangle is equal to length times width, that is, S= length x width.
The area formula of a square: the area of a square is equal to the square of the side length, that is, S= side length × side length.
The area formula of triangle: the area of triangle is equal to the bottom multiplied by half the height, that is, S= bottom × height ÷2.
The area formula of trapezoid: the area of trapezoid is equal to the upper bottom surface plus the lower bottom surface multiplied by half the height, that is, S= (upper bottom surface+lower bottom surface) × height ÷2.
The area formula of a circle: the area of a circle is equal to the square of the radius multiplied by π, that is, S= radius× radius× π.
The area formula of the sector: the area of the sector is equal to the square of the radius multiplied by half a radian, that is, S= radius × radius × radian ÷2.
The area formula of an ellipse is equal to half of the major axis and minor axis times π, that is, S= major axis × minor axis ×π÷2.
In a word, different figures have different area formulas, so we need to choose the appropriate formula to calculate according to the specific situation. Mastering these area formulas can help us better understand and calculate the area of various graphs and improve our mathematical ability and practical application ability.