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Two squares of side a are placed side by side to make a rectangle. Which formula gives the perimeter of the rectangle?

Class 7Formulas and Rules from PatternsAlgebra

A $6 a$
B $2 a \times a$
C $4 a$
D $8 a$

Step-by-Step Solution

The rectangle is

2 a

long and a wide. Perimeter =

2 (2 a + a) = 6 a . (8 a

counts the shared side twice.)

Answer: A)

6 a

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