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b = 3 * a
2a + 2 ( 3*a) = 20
b = 3a
2a + 6a = 20
b = 3a
8a = 20 /: 8
b = 3a
a = 2,5
b = 3* 2,5
a = 2,5
b = 7,7
Pole prostokąta = a * b
P = 2,5 * 7,5 = 18,75cm²
3x dluzszy
3x*2+ x*2 = 20
8x= 20
x=2,5
Pole
a*b
2,5* (3*2,5 )=18,75
pole wynosi 18,75
8x=20
x=2.5
p=7.5x2.5=18.75