Calculating The Area And The Perimeter - Math Planet

Pre-Algebra / Inequalities and one-step equations / Calculating the area and the perimeter Do excercises Show all 2 exercises

• Area - Rectangle
• Area and perimeter

The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. x is in this case the length of the rectangle while y is the width of the rectangle.

The perimeter, P, is:

$$P= x+x+y+y$$

$$P=2x+2y$$

$$P=2(x+y)$$

Example

Find the perimeter of this rectangle:

$$P=7+7+4+4$$

$$P=2\cdot 7+2\cdot 4$$

$$P=2\cdot (7+4)$$

$$P=2\cdot 11$$

$$P=22\,in$$

The area is measurement of the surface of a shape. To find the area of a rectangle or a square you need to multiply the length and the width of a rectangle or a square.

Area, A, is x times y.

$$A=x\cdot y$$

Example

Find the area of this square.

$$A=x\cdot y$$

$$A=5\cdot 5$$

$$A=25\,in^{2}$$

There are different units for perimeter and area The perimeter has the same units as the length of the sides of rectangle or square whereas the area's unit is squared.

Video lesson

Calculate the perimeter and the area in feet

Do excercises Show all 2 exercises

• Area - Rectangle
• Area and perimeter

More classes on this subject Pre-Algebra Inequalities and one-step equations: Different ways to solve equations Pre-Algebra Inequalities and one-step equations: Understanding inequalities and equations

Next Chapter:

INEQUALITIES AND ONE-STEP EQUATIONS – Solving inequalities Search

• Math Playground All courses
  • • Math Playground Overview
• Programming All courses
  • • Programming Overview
• Pre-Algebra All courses
  • • Pre-Algebra Overview
    • Introducing Algebra
      • Pre-Algebra
      • Introducing Algebra
        • Overview
        • Operations in the correct order
        • Evaluate expressions
        • Identify properties
        • Equations with variables
        • Coordinate system and ordered pairs
        • Inequalities
    • Explore and understand integers
      • Pre-Algebra
      • Explore and understand integers
        • Overview
        • Absolute value
        • Adding and subtracting integers
        • Multiplying and dividing with integers
    • Inequalities and one-step equations
      • Pre-Algebra
      • Inequalities and one-step equations
        • Overview
        • Different ways to solve equations
        • Calculating the area and the perimeter
        • Solving inequalities
        • Understanding inequalities and equations
      • About Mathplanet
      • Cookie settings
    • Discover fractions and factors
      • Pre-Algebra
      • Discover fractions and factors
        • Overview
        • Monomials and adding or subtracting polynomials
        • Powers and exponents
        • Multiplying polynomials and binomials
        • Factorization and prime numbers
        • Finding the greatest common factor
        • Finding the least common multiple
    • More about the four rules of arithmetic
      • Pre-Algebra
      • More about the four rules of arithmetic
        • Overview
        • Integers and rational numbers
        • Learn how to estimate calculations
        • Calculating with decimals and fractions
        • Geometric sequences of numbers
        • Scientific notation
    • More about equation and inequalities
      • Pre-Algebra
      • More about equation and inequalities
        • Overview
        • Fundamentals in solving Equations in one or more steps
        • Calculating the circumference of a circle
    • Graphing and functions
      • Pre-Algebra
      • Graphing and functions
        • Overview
        • Linear equations in the coordinate plane
        • The slope of a linear function
        • Graphing linear inequalities
        • Solve systems of equations by graphing
    • Ratios and percent
      • Pre-Algebra
      • Ratios and percent
        • Overview
        • Rates and ratios
        • Proportions and percent
        • Solving problems with percentages
    • Probability and statistics
      • Pre-Algebra
      • Probability and statistics
        • Overview
        • The mean, the median and the mode
        • Stem-and-Leaf Plots and Box-and-Whiskers Plot
        • Calculating the outcome
        • Combinations and permutations
        • Finding the odds
        • Probability of events
    • Introducing geometry
      • Pre-Algebra
      • Introducing geometry
        • Overview
        • Geometry – fundamental statements
        • Circle graphs
        • Angles and parallel lines
        • Triangles
        • Quadrilaterals, polygons and transformations
    • Area and Volume
      • Pre-Algebra
      • Area and Volume
        • Overview
        • Measure areas
        • Pyramids, prisms, cylinders and cones
    • Right triangles and algebra
      • Pre-Algebra
      • Right triangles and algebra
        • Overview
        • Square roots and real numbers
        • The Pythagorean Theorem
        • Trigonometry
• Algebra 1 All courses
  • • Algebra 1 Overview
• Algebra 2 All courses
  • • Algebra 2 Overview
• Geometry All courses
  • • Geometry Overview
• SAT All courses
  • • SAT Overview
• ACT All courses
  • • ACT Overview