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12(B13). Объём кирпича с вырезанным кирпичиком (вар. 41)
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Перед нами обыкновенный кирпич с вырезанным из него кирпичиком.
Прикроем дощечками образовавшуюся брешь. Сначала левую стенку,
затем переднюю и наконец, положим сверху крышечку.
Посчитаем объём большого кирпича и вычтем из него объём маленького.
Vбол. = 4 · 3 · 3 = 36
Vмал. = 2 · 1 · 1 = 2
Vфиг. = 36 - 2 = 34
Ответ: 34