Поскольку tgA = AB/BC и BC = AC = 2, то получаем:
tgA = AB/2
AB = 2*tgA
AB = 2*(2/√21)
AB = 4/√21
AB = 4√21/21
Итак, AB = 4√21/21.
Поскольку tgA = AB/BC и BC = AC = 2, то получаем:
tgA = AB/2
AB = 2*tgA
AB = 2*(2/√21)
AB = 4/√21
AB = 4√21/21
Итак, AB = 4√21/21.