Решение:
Угол:
α° = arccos(
)
= arccos(
11.882+16.582-11.572
2·11.88·16.58
)
= arccos(
141.1344+274.8964-133.8649
393.94
)
= 44.25°
Периметр:
P = a + b + c
= 11.57 + 11.88 + 16.58
= 40.03
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√20.02·(20.02-11.57)·(20.02-11.88)·(20.02-16.58)
=√20.02 · 8.45 · 8.14 · 3.44
=√4737.0026704
= 68.83
Высота :
ha =
=
= 11.9
hb =
=
= 11.59
hc =
=
= 8.303
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(44.25°))
= arcsin(1.027·0.6978)
= 45.78°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(44.25°))
= arcsin(1.433·0.6978)
= 89.41°