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2013-03-02T12:55:51+01:00

BH = BD/2
BD² = BC² + CD² = 230² + 230² = 2*230²
BH = 230V2 / 2 = 115V2
tg(ABH) = AH/BH = 147/115V2 = 0.9
ABH = 42°

 

IH² = BH² - BI²
BI = BC/2 = 115
IH² = (115V2)² - 115² = 115²
tg(AIH) = AH/IH = 147/115 = 1.28
AIH = 52°