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Area of rectangles & squares

Measurement

Japanese school year: Elementary 4

What you learn

Learn the formulas to calculate the areas of rectangles and squares by multiplying their side lengths. This method is practical for measuring floor space or paper sizes in daily activities. Having a solid proficiency in multiplication and understanding the properties of rectangles and squares will make calculations easy.

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Key points

This formula finds the area S of a rectangle. Multiply the length a by the width b.

S=abS = ab

This formula finds the area S of a square. Multiply the side length a by itself.

S=a2S = a^2

This formula finds the perimeter L of a rectangle. Add the length a and width b, then multiply by 2.

L=2(a+b)L = 2(a + b)

This formula finds the perimeter L of a square. Multiply the side length a by 4.

L=4aL = 4a

Choose a set to practice.