# What are the formulas for perimeter and area?

## What are the formulas for perimeter and area?

Area and Perimeter Formulas

Shape Area Perimeter
Triangle A = ½ × b × h S = a+b+c
Square A = a2 P = 4a
Rectangle A = l × w P = 2(l + w)
Parallelogram A = b × h P = 2(a+b)

How do you find the perimeter and area of different shapes?

To find the perimeter, add together the lengths of the sides. Start at the top and work clockwise around the shape. Area of Polygon = (Area of A) + (Area of B) To find the area, divide the polygon into two separate, simpler regions.

### What is the formula for perimeter of all shapes?

Perimeter Formulas

Geometric Shape Perimeter Formula Metrics
Triangle a + b + c a, b and c being the side lengths
Rectangle 2(Length + Width)
Square 4a a =Length of a side
Trapezoid a + b + c + d a, b, c, d being the sides of the trapezoid

What is the formula for all shapes?

Formula for geometrical figures

Shape Formula
Square 4 × side
Rectangle 2 × (length + width)
Parallelogram 2 × (side1 + side2)
Triangle side1 + side2 + side3

## How do you find the area of shapes?

Area is calculated by multiplying the length of a shape by its width.

How do you find the perimeter of an area?

To get the perimeter from the area for a square, multiply the square root of the area times 4 . Perimeter is always measured in linear units, which is derived from the area’s square units.

### What is perimeter of shape?

The perimeter of a shape is the total measurement of all the edges of a shape e.g. a triangle has three edges, so its perimeter is the total of those three edges added together. The perimeter of a rectangle can be calculated by adding the length and width together and doubling it.

How do you find the area of irregular shapes?

To calculate the Area of Irregular Shapes, divide the Shape with curves into two or more Regular Shapes. In this method, divide an Irregular Shape into multiple Squares, triangles, or other Quadrilaterals. Depending on the Shape or curves, a part of the figure can be a circle, semicircle or quadrant as well.

## What is area of a shape?

The area of a shape is the “space enclosed within the perimeter or the boundary” of the given shape. We calculate the area for different shapes using math formulas.

What is the perimeter of irregular shapes?

How to find perimeter?

Regular Polygons Irregular Polygons
Perimeter = 4 + 4 + 4 + 4 = 16 cm OR Perimeter of regular polygons = number of sides x length of one side = 4 x 4 = 16 Perimeter of irregular polygons = 5 + 3 + 2 + 4 + 3 + 7 = 24 cm

### What is the formula for perimeter of a irregular shape?

The area of the irregular shape is the area of the two rectangles added together. Use the measure calculate feature of Geometer’s Sketchpad to add the areas. The perimeter of the irregular shape is equal to the sum of the six segment around the outside of the figure.

How do you find the area of all shapes?

How to calculate area?

1. Square area formula: A = a²
2. Rectangle area formula: A = a * b.
3. Triangle area formulas: A = b * h / 2 or.
4. Circle area formula: A = πr²
5. Circle sector area formula: A = r² * angle / 2.
6. Ellipse area formula: A = a * b * π
7. Trapezoid area formula: A = (a + b) * h / 2.
8. Parallelogram area formulas: