Dane :
Bok : a
Bok : b = 3a
Obw = 72 dm
Obw = 2a + 2b
72 = 2a + 2*3a
72 = 2a + 6a
8a = 72 /:8
a = 9 dm
b= 3a = 3*9 = 27 dm
P= a * b
P = 9 * 27 = 243 dm²
Odp. Pole tego prostokąta wynosi 243 dm²
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Dane :
Bok : a
Bok : b = 3a
Obw = 72 dm
Obw = 2a + 2b
72 = 2a + 2*3a
72 = 2a + 6a
8a = 72 /:8
a = 9 dm
b= 3a = 3*9 = 27 dm
P= a * b
P = 9 * 27 = 243 dm²
Odp. Pole tego prostokąta wynosi 243 dm²