Решение:
Сторона:
b = √a2 + c2 - 2ac·cos(β°)
= √12 + 10.12 - 2·1·10.1·cos(101.42°)
= √1 + 102.01 - 20.2·-0.198
= √107.01
= 10.34
Высота :
hc = a·sin(β°)
= 1·sin(101.42°)
= 1·0.9802
= 0.9802
Угол:
α° = arcsin(
sin(β°))
= arcsin(
sin(101.42°))
= arcsin(0.09671·0.9802)
= 5.44°
или:
α° = arccos(
)
= arccos(
10.342+10.12-12
2·10.34·10.1
)
= arccos(
)
= 5.451°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(101.42°))
= arcsin(0.9768·0.9802)
= 73.23°
Периметр:
P = a + b + c
= 1 + 10.34 + 10.1
= 21.44
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√10.72·(10.72-1)·(10.72-10.34)·(10.72-10.1)
=√10.72 · 9.72 · 0.38 · 0.62
=√24.54914304
= 4.955
Высота :
ha =
=
= 9.91
hb =
=
= 0.9584