Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 63.99°
Периметр:
P = a + b + c
= 5.7 + 5.7 + 5
= 16.4
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√8.2·(8.2-5.7)·(8.2-5.7)·(8.2-5)
=√8.2 · 2.5 · 2.5 · 3.2
=√164
= 12.81
Высота :
ha =
=
= 4.495
hb =
=
= 4.495
hc =
=
= 5.124
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(63.99°))
= arcsin(1·0.8987)
= 63.99°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(63.99°))
= arcsin(0.8772·0.8987)
= 52.03°