Решение:
Угол:
α° = arccos(
)
= arccos(
18552+15152-18252
2·1855·1515
)
= arccos(
3441025+2295225-3330625
5620650
)
= 64.66°
Периметр:
P = a + b + c
= 1825 + 1855 + 1515
= 5195
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√2597.5·(2597.5-1825)·(2597.5-1855)·(2597.5-1515)
=√2597.5 · 772.5 · 742.5 · 1082.5
=√1612792173867.2
= 1269958
Высота :
ha =
=
= 1391.7
hb =
=
= 1369.2
hc =
=
= 1676.5
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(64.66°))
= arcsin(1.016·0.9038)
= 66.67°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(64.66°))
= arcsin(0.8301·0.9038)
= 48.61°