Topic Details (Notes format)

How to Calculate Perimeter of Polygons

Subject: Mathematics

Book: Maths Mastery

A polygon’s perimeter is the sum of the lengths of its sides. For instance, if you have a rectangle of length 8 cm and width 5 cm, the perimeter is 2(8 + 5) = 26 cm. For a pentagon with sides 4, 4, 5, 7, and 7, the perimeter is 4 + 4 + 5 + 7 + 7 = 27. Perimeter calculations guide practical decisions like fencing land, framing pictures, or sewing. Learning to quickly sum side lengths fosters efficiency in geometry problems, blueprint analysis, and real-world measurement tasks.

Practice Questions

What is the sum of all even numbers between 1 and 100?

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If 2x = 16, what is the value of x?

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If the length of a rectangle is doubled and the width is halved, what is the change in area?

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A train 150 m long passes a pole in 15 seconds. What is its speed?

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If the sum of the squares of two consecutive positive integers is 365, what are the integers?

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The simple interest on Rs. 4000 at 5% per annum for 2 years is:

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If sin(A) = 1/2 and A is acute, what is the value of A?

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A man spends 75% of his income and saves Rs. 600. What is his total income?

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If x - y = 5 and x + y = 15, what is the value of x?

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What is the value of x if 3x + 7 = 16?

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