Решение:
Угол:
γ° = 180 - α° - β°
= 180 - 87.8° - 78.1°
= 14.1°
Сторона:
a = c·
= 85·
= 85·
= 85·4.102
= 348.67
Сторона:
b = c·
= 85·
= 85·
= 85·4.017
= 341.45
Периметр:
P = a + b + c
= 348.67 + 341.45 + 85
= 775.12
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√387.56·(387.56-348.67)·(387.56-341.45)·(387.56-85)
=√387.56 · 38.89 · 46.11 · 302.56
=√210273006.39227
= 14500.8
Высота :
ha =
=
= 83.18
hb =
=
= 84.94
hc =
=
= 341.2