Question

If the perimeter of a square size handkerchief is 225cm, what is its length?

Answer 1

Answer:

60 cm is the correct answer

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Answer 2

Step-by-step explanation:

Answer

The formula for the area of a square is:

A=s

2

Where:

A is the area of the square.

s is the length of the side of a square.

Substituting and solving for s gives:

225 cm

2

=s

2

We can take the square root of each side of the equation giving:

225

cm

2

=

s

2

15 cm=s

s=15 cm

The formula for the perimeter of a square is:

p=4s

Where:

p is the perimeter of the square.

s is the length of the side of a square.

Substituting for s from the solution for the previous formula and calculating p gives:

p=4×15 cm

p=60cm