Решение:
Угол:
α° = arccos(
)
= arccos(
41502+33302-28402
2·4150·3330
)
= arccos(
17222500+11088900-8065600
27639000
)
= 42.9°
Периметр:
P = a + b + c
= 2840 + 4150 + 3330
= 10320
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√5160·(5160-2840)·(5160-4150)·(5160-3330)
=√5160 · 2320 · 1010 · 1830
=√22126368960000
= 4703867
Высота :
ha =
=
= 3312.6
hb =
=
= 2266.9
hc =
=
= 2825.1
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(42.9°))
= arcsin(1.461·0.6807)
= 83.99°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(42.9°))
= arcsin(1.173·0.6807)
= 52.98°