Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 45.56°
Периметр:
P = a + b + c
= 9.1 + 12.3 + 11
= 32.4
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√16.2·(16.2-9.1)·(16.2-12.3)·(16.2-11)
=√16.2 · 7.1 · 3.9 · 5.2
=√2332.6056
= 48.3
Высота :
ha =
=
= 10.62
hb =
=
= 7.854
hc =
=
= 8.782
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(45.56°))
= arcsin(1.352·0.714)
= 74.87°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(45.56°))
= arcsin(1.209·0.714)
= 59.68°