Topic Details (Notes format)

How to Identify and Use Perfect Cubes

Subject: Mathematics

Book: Maths Mastery

A perfect cube is an integer that is the cube of another integer, such as 27 = 3³ or 64 = 4³. Spotting these efficiently helps with factoring polynomials (like x³ – 8) or simplifying cube roots. Perfect cubes appear in 3D volume calculations, for instance, a 5×5×5 cube has a volume of 125. Understanding these patterns (1, 8, 27, 64, 125, ...) can streamline computations and deepen your exploration of algebraic identities like a³ ± b³. Whether comparing volumes or factoring expressions, perfect cubes are a potent tool in advanced math and practical tasks.

Practice Questions

What is the length of the diagonal of a square with a side length of 7 cm?

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How many diagonals does a pentagon have?

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If a:b = 3:4 and b:c = 5:6, what is a:c?

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If sin(x) = 3/5 and x is in the first quadrant, what is cos(x)?

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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 sin(A) = 3/5 and cos(B) = 5/13, where A and B are acute angles, what is sin(A+B)?

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If the cost price of an item is Rs. 400 and the selling price is Rs. 500, what is the profit percentage?

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The angles of a quadrilateral are in the ratio 3:4:5:6. What is the largest angle?

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If a:b = 2:3 and b:c = 4:5, what is a:c?

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If the sum of three consecutive integers is 72, what are the integers?

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