△ABF:
AF =BF ctg60°
△KBF:
FK =BF ctg31°
AK =BF(ctg60°+ctg31°) =12(1/√3 +ctg31°) =4√3 +12ctg31° ~26,9
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△ABF:
AF =BF ctg60°
△KBF:
FK =BF ctg31°
AK =BF(ctg60°+ctg31°) =12(1/√3 +ctg31°) =4√3 +12ctg31° ~26,9