Решение:
Угол:
α° = arccos(
)
= arccos(
6.262+5.722-4.52
2·6.26·5.72
)
= arccos(
39.1876+32.7184-20.25
71.61
)
= 43.83°
Периметр:
P = a + b + c
= 4.5 + 6.26 + 5.72
= 16.48
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√8.24·(8.24-4.5)·(8.24-6.26)·(8.24-5.72)
=√8.24 · 3.74 · 1.98 · 2.52
=√153.76749696
= 12.4
Высота :
ha =
=
= 5.511
hb =
=
= 3.962
hc =
=
= 4.336
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(43.83°))
= arcsin(1.391·0.6925)
= 74.42°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(43.83°))
= arcsin(1.271·0.6925)
= 61.66°