Formulas for calculating the perimeter and area of various plane figures

Planar figures are rectangles, squares, triangles, parallelograms, trapezoids, circles, etc., and their perimeter and area formulas are calculated as follows:

1. Rectangles

Perimeter=(length+width)x2, area=length x width.

2. Square

Perimeter = side length x 4, area = side length x side length.

3. Triangle

Perimeter = side length a + side length b + side length c, area = base x height/2 = ah/2 .

4, Parallelogram

Circumference = side length ax2 + side length bx2, area = base x height = ah.

5, Trapezoid

Circumference = side length a + side length b + side length c + side length d, area = (top bottom + bottom bottom) x height/2 = (a + b)h/2.

6, Circle

Circumference = diameter x π = radius x 2x π and area = π x radius x radius.

Expanded:

Calculation of perimeter and area of a plane figure: a plane figure is a type of geometric figure that refers to a figure in which all the points are in the same plane, e.g., a straight line, a triangle, a flat quadrilateral, etc. are all basic plane figures.

Perimeter refers to the integral of the length around the edge of a region of finite area, that is, the length of the figure in one week. Perimeter is denoted by the letter C. The perimeter of a plane figure is the sum of the lengths of the edges of the area of the figure, so the formula is the sum of all the side lengths, except for a circle, where pi is used.

The area is the size of the plane figure it occupies, and it is denoted by the letter S. The area of a plane figure is basically the base multiplied by the height of the triangle, but also divided by 2; height is the line perpendicular to the bottom edge, so the rectangle square these heights is its width or length of the side.

The perimeter and area of a plane figure have a fixed formula, as long as you understand and remember on the line.