Решение:
Сторона:
b = √a2 + c2 - 2ac·cos(β°)
= √5002 + 5002 - 2·500·500·cos(115°)
= √250000 + 250000 - 500000·-0.4226
= √711300
= 843.39
Высота :
hc = a·sin(β°)
= 500·sin(115°)
= 500·0.9063
= 453.15
Угол:
α° = arcsin(
sin(β°))
= arcsin(
sin(115°))
= arcsin(0.5928·0.9063)
= 32.5°
или:
α° = arccos(
)
= arccos(
843.392+5002-5002
2·843.39·500
)
= arccos(
711306.6921+250000-250000
843390
)
= 32.5°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(115°))
= arcsin(0.5928·0.9063)
= 32.5°
Периметр:
P = a + b + c
= 500 + 843.39 + 500
= 1843.4
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√921.7·(921.7-500)·(921.7-843.39)·(921.7-500)
=√921.7 · 421.7 · 78.31 · 421.7
=√12835536129.121
= 113294
Высота :
ha =
=
= 453.18
hb =
=
= 268.66