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AD = 4√2 cm
BD = 2√5 cm
AB^2 = AD^2 + BD^2 - 2 AD. BD . Cos 2^2 = (4√2)^2 + (2√5)^2 - 2. 4√2. 2√5 . Cos < ADB
4 = 32 + 20 - 16√10 . Cos 4 = 52 - 16√10.cos -48 = -16√10 . Cos 3/10 √10 = cos
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