**Contents**show

## How do you calculate the area of a door?

To find the area of a rectangle, **multiply its height by its width**. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.

## What is area formula?

Perimeter, Area, and Volume

Table 2. Area Formulas | ||
---|---|---|

Shape | Formula | Variables |

Square | A=s2 |
s is the length of the side of the square. |

Rectangle | A=LW | L and W are the lengths of the rectangle’s sides (length and width). |

Triangle | A=12bh | b and h are the base and height |

## How do you find the area of an object?

Find the area of a square or rectangle **by multiplying the length times the width**. This formula looks like l*w. If the length is 5 and the width is 2, the area is 10 square units. Calculate the area of a four-sided shape that is not a rectangle by multiplying the base (one of the sides) by the height.

## What is the perimeter formula?

The perimeter is equal to the boundary of the rectangle which can be calculated with the formula: **Perimeter = Length + Length + Width + Width = 2(Length + Width)**.

## How do u find the mean?

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is **the sum divided by the count**.

## What are the formulas for area and perimeter?

Area and Perimeter Formula Chart

Figures | Area Formula | Variables |
---|---|---|

Area of Rectangle | Area = l × w | l = length w = width |

Area of Square | Area = a^{2} |
a = sides of the square |

Area of a Triangle | Area = 1/2 b×h | b = base h = height |

Area of a Circle | Area = πr^{2} |
r = radius of the circle |