Решение:
Угол:
γ° = 180 - α° - β°
= 180 - 45° - 15°
= 120°
Сторона:
a = c·
= 4·
= 4·
= 4·0.8165
= 3.266
Сторона:
b = c·
= 4·
= 4·
= 4·0.2988
= 1.195
Периметр:
P = a + b + c
= 3.266 + 1.195 + 4
= 8.461
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√4.231·(4.231-3.266)·(4.231-1.195)·(4.231-4)
=√4.231 · 0.965 · 3.036 · 0.231
=√2.86341361614
= 1.692
Высота :
ha =
=
= 1.036
hb =
=
= 2.832
hc =
=
= 0.846