Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 82.82°
Периметр:
P = a + b + c
= 6 + 5 + 4
= 15
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√7.5·(7.5-6)·(7.5-5)·(7.5-4)
=√7.5 · 1.5 · 2.5 · 3.5
=√98.4375
= 9.922
Высота :
ha =
=
= 3.307
hb =
=
= 3.969
hc =
=
= 4.961
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(82.82°))
= arcsin(0.8333·0.9922)
= 55.77°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(82.82°))
= arcsin(0.6667·0.9922)
= 41.41°