Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 63.41°
Периметр:
P = a + b + c
= 86 + 86 + 77
= 249
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√124.5·(124.5-86)·(124.5-86)·(124.5-77)
=√124.5 · 38.5 · 38.5 · 47.5
=√8765655.9375
= 2960.7
Высота :
ha =
=
= 68.85
hb =
=
= 68.85
hc =
=
= 76.9
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(63.41°))
= arcsin(1·0.8942)
= 63.41°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(63.41°))
= arcsin(0.8953·0.8942)
= 53.19°