Решение:
Сторона:
b = √a2 + c2 - 2ac·cos(β°)
= √12 + 10.12 - 2·1·10.1·cos(115.58°)
= √1 + 102.01 - 20.2·-0.4318
= √111.73
= 10.57
Высота :
hc = a·sin(β°)
= 1·sin(115.58°)
= 1·0.902
= 0.902
Угол:
α° = arcsin(
sin(β°))
= arcsin(
sin(115.58°))
= arcsin(0.09461·0.902)
= 4.895°
или:
α° = arccos(
)
= arccos(
10.572+10.12-12
2·10.57·10.1
)
= arccos(
)
= 4.884°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(115.58°))
= arcsin(0.9555·0.902)
= 59.53°
Периметр:
P = a + b + c
= 1 + 10.57 + 10.1
= 21.67
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√10.84·(10.84-1)·(10.84-10.57)·(10.84-10.1)
=√10.84 · 9.84 · 0.27 · 0.74
=√21.31178688
= 4.616
Высота :
ha =
=
= 9.232
hb =
=
= 0.8734