Ответ:
S = (a+b)*h/2
a = 4 дм
b = a + 2 дм + 1 дм = 4 дм + 3 дм = 7 дм
h = 4 дм
S = (4+7)*4/2 = 11*2 = 22 дм²
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Ответ:
S = (a+b)*h/2
a = 4 дм
b = a + 2 дм + 1 дм = 4 дм + 3 дм = 7 дм
h = 4 дм
S = (4+7)*4/2 = 11*2 = 22 дм²