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Danny1210
2020-06-07 17:56:31

8a) CD=AB angle CDE = 90 tan45=25/CD CD=25
Danny1210
2020-06-07 18:04:05

b) in triangle CED , CE = 25^2 + 25^2 =CE^2 (Pythagoras’ Theorem) CE=35.35533906 in triangle FCE , 39^2 + 25^2 = CF^2(Pythagoras’ Theorem) CF= 46.32493929 Therefore , the length that the ladder extends = 46.32493929-35.35533906 = 10.96960023 m
Danny1210
2020-06-07 18:05:43

system can't save the format 你自己跟返的空白位隔行

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