Решение:
Угол:
α° = arccos(
)
= arccos(
)
= arccos(
)
= 75.52°
Периметр:
P = a + b + c
= 6 + 3 + 6
= 15
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√7.5·(7.5-6)·(7.5-3)·(7.5-6)
=√7.5 · 1.5 · 4.5 · 1.5
=√75.9375
= 8.714
hb =
=
= 5.809
hc =
=
= 2.905
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(75.52°))
= arcsin(0.5·0.9682)
= 28.95°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(75.52°))
= arcsin(1·0.9682)
= 75.51°