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아이가 이 문제를 계속 풀어보는데 아직 이해가 안간다고 하네요.
문제 1. A man on the deck of a ship is 13ft above water level.
He observes that the angle of elevation of the top of a cliff is 40도 and
the angle of depression of the base is 20도. Find the distance of the cliff from
the ship and the height of the cliff if the base of the cliff is at sea level.문제 2. An escalator from the ground floor to the second floor of a department store
is 110 ft long and rises 32 ft. vertically.
What is the escalator’s angle of elevation?지나치지 마시고 설명과 함께 풀어주세요
감사합니다.