Решение:
Угол:
α° = arccos(
)
= arccos(
0.352+1.952-1.992
2·0.35·1.95
)
= arccos(
0.1225+3.8025-3.9601
1.365
)
= 91.47°
Периметр:
P = a + b + c
= 1.99 + 0.35 + 1.95
= 4.29
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√2.145·(2.145-1.99)·(2.145-0.35)·(2.145-1.95)
=√2.145 · 0.155 · 1.795 · 0.195
=√0.116374561875
= 0.3411
Высота :
ha =
=
= 0.3428
hb =
=
= 1.949
hc =
=
= 0.3498
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(91.47°))
= arcsin(0.1759·0.9997)
= 10.13°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(91.47°))
= arcsin(0.9799·0.9997)
= 78.41°