Решение:
Угол:
α° = arcsin(
sin(γ°))
= arcsin(
sin(120°))
= arcsin(0.277·0.866)
= 13.88°
или:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 13.83°
Угол:
β° = arcsin(
sin(γ°))
= arcsin(
sin(120°))
= arcsin(0.831·0.866)
= 46.03°
Периметр:
P = a + b + c
= 1 + 3 + 3.61
= 7.61
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√3.805·(3.805-1)·(3.805-3)·(3.805-3.61)
=√3.805 · 2.805 · 0.805 · 0.195
=√1.675398099375
= 1.294
Высота :
ha =
=
= 2.588
hb =
=
= 0.8627
hc =
=
= 0.7169