High School

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Write the perimeter of the following shapes:

(a) A square with sides of 15 inches.

(b) A rectangle with sides of 7 cm and 18 cm.

Answer :

To find the perimeter of shapes, we add up the lengths of all their sides.

  1. Perimeter of a Square:

    A square has four equal sides. If the side length of a square is 15 inches, we can calculate its perimeter by multiplying the side length by 4.

    [tex]\text{Perimeter of the square} = 4 \times 15 = 60 \text{ inches}[/tex]

    So, the perimeter of the square is 60 inches.

  2. Perimeter of a Rectangle:

    A rectangle has opposite sides that are equal in length. To find the perimeter, you add up the lengths of all four sides. In this case, the rectangle has sides of 7 cm and 18 cm.

    The formula for the perimeter [tex]P[/tex] of a rectangle is:

    [tex]P = 2 \times (\text{length} + \text{width})[/tex]

    Substituting the given values:

    [tex]P = 2 \times (18 + 7) = 2 \times 25 = 50 \text{ cm}[/tex]

    Therefore, the perimeter of the rectangle is 50 centimeters.

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