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y - szer. boku prostokata
y = 4/7x
obwód = 2x + 2y
obwód = 2x + 2*(4/7x)
44 = (14/7)x + (8/7)x
44 = (22/7)x
x = 44: (22/7)
x = 14 cm
y = 4/7 *14 = 8 cm
Pole = x*y = 14cm * 8 cm = 112 cm ^2
spr. 8 =4/7*14 L = P
2*8 + 2*14 = 16 + 28 = 44 L= P