Topic Details (Notes format)

How to Calculate the Area of a Rectangle

Subject: Mathematics

Book: Maths Mastery

Rectangles form the basis of countless geometric and real-life applications, from plotting out rooms to determining the surface area of rectangular objects. The area formula is A = length × width. For example, a 12 m by 8 m rectangle has an area of 96 m². This simple calculation underlies more complex designs, such as floor plans or packaging materials. Grasping rectangular area helps you swiftly compute how much paint to buy for a wall or how large a garden bed is, making it indispensable in practical problem-solving.

Practice Questions

A cone has a base radius of 7 cm and height of 24 cm. What is its volume?

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A number is increased by 20% and then decreased by 20%. What is the net change?

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If a = 5 and b = 12, what is the length of the hypotenuse of a right triangle?

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What is the cube of 4?

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If x:y = 2:3 and z:y = 4:3, what is x:z?

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What is the 7th term of the arithmetic progression 3, 6, 9, 12,...?

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A rectangle has an area of 48 cm² and a length of 8 cm. What is its width?

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What is the sum of all even numbers between 1 and 50?

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A sum triples in 20 years at simple interest. What is the rate of interest per annum?

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