Решение:
Угол:
α° = arccos(
)
= arccos(
6.372+4.452-4.922
2·6.37·4.45
)
= arccos(
40.5769+19.8025-24.2064
56.69
)
= 50.35°
Периметр:
P = a + b + c
= 4.92 + 6.37 + 4.45
= 15.74
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√7.87·(7.87-4.92)·(7.87-6.37)·(7.87-4.45)
=√7.87 · 2.95 · 1.5 · 3.42
=√119.100645
= 10.91
Высота :
ha =
=
= 4.435
hb =
=
= 3.425
hc =
=
= 4.903
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(50.35°))
= arcsin(1.295·0.77)
= 85.67°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(50.35°))
= arcsin(0.9045·0.77)
= 44.14°