The length of the rectangle is 80 cm and the perimeter is 2 meters 14 centimeters, write down the formulas and find out what the width of the area of the rectangle is.
Let’s write down the formula for the perimeter of a rectangle, substitute the known data and find the width, then the area.
P = 2 * (a + b).
2 meters 14 centimeters = 2 * 100 + 14 = 214 (cm).
214 = 2 * (80 + b)
107 = 80 + b
b = 27 (cm) – width.
Find the area:
S = a * b = 80 * 27 = 2160 (cm²).
Answer: width 27 cm, area 2160 cm².
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