Решение:
Сторона:
a = √b2 + c2 - 2bc·cos(α°)
= √18002 + 5002 - 2·1800·500·cos(91°)
= √3240000 + 250000 - 1800000·-0.01745
= √3521410
= 1876.5
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(91°))
= arcsin(0.9592·0.9998)
= 73.54°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(91°))
= arcsin(0.2665·0.9998)
= 15.45°
Периметр:
P = a + b + c
= 1876.5 + 1800 + 500
= 4176.5
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√2088.3·(2088.3-1876.5)·(2088.3-1800)·(2088.3-500)
=√2088.3 · 211.8 · 288.3 · 1588.3
=√202533105786.37
= 450036.8
Высота :
ha =
=
= 479.66
hb =
=
= 500.04
hc =
=
= 1800.1