P = (AB + AD) · 2,
AD = 2AB,
P = (AB + 2AB) · 2,
P = 6AB,
6AB = 18 см,
AB = 3 см,
AD = 2AB = 6 см,
S = AB · AD = 3 · 6 = 18 см² - это ответ.
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P = (AB + AD) · 2,
AD = 2AB,
P = (AB + 2AB) · 2,
P = 6AB,
6AB = 18 см,
AB = 3 см,
AD = 2AB = 6 см,
S = AB · AD = 3 · 6 = 18 см² - это ответ.