Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 71.79°
Периметр:
P = a + b + c
= 80 + 80 + 50
= 210
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√105·(105-80)·(105-80)·(105-50)
=√105 · 25 · 25 · 55
=√3609375
= 1899.8
Высота :
ha =
=
= 47.5
hb =
=
= 47.5
hc =
=
= 75.99
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(71.79°))
= arcsin(1·0.9499)
= 71.79°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(71.79°))
= arcsin(0.625·0.9499)
= 36.42°