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Wikipedia definition
1. Sloped armourSloped armour is armour that is neither in a vertical nor a horizontal position. Such "angled" armour is often mounted on tanks and other armoured fighting vehicles (AFVs). Sloping an armour plate makes it harder to penetrate for antitank-weapons, such as armour-piercing shells and rockets, if they take a more or less horizontal path to their target, as is often the case. The better protection is caused by three main effects.
Read “Sloped armour” on English Wikipedia
Read “避弾経始” on Japanese Wikipedia
Read “Sloped armour” on DBpedia

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