For a figurative representation, you can build a rectangle (a quadrilateral with all angles straight).
1) What is the length of a rectangle if it is 4 times the width of this quadrangle (3cm)?
3 * 4 = 12 (cm) the length of the rectangle.
2) What is the perimeter of a rectangle if it is 12 cm long and 3 cm wide? P = (a + b) * 2; P = a * 2 + b * 2; P = a + a + b + b.
(12 + 3) * 2 = 30 (cm) perimeter of the rectangle.
3) What is the area of the rectangle? S = a * b.
12 * 3 = 36 (cm ^ 2) area of the rectangle.
Answer: 30 centimeters perimeter and 36 square centimeters rectangle area.
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