Решение:
Сторона:
b = √a2 + c2 - 2ac·cos(β°)
= √91.222 + 352 - 2·91.22·35·cos(106.9°)
= √8321.1 + 1225 - 6385.4·-0.2907
= √11402.3
= 106.78
Высота :
hc = a·sin(β°)
= 91.22·sin(106.9°)
= 91.22·0.9568
= 87.28
Угол:
α° = arcsin(
sin(β°))
= arcsin(
sin(106.9°))
= arcsin(0.8543·0.9568)
= 54.82°
или:
α° = arccos(
)
= arccos(
106.782+352-91.222
2·106.78·35
)
= arccos(
11401.9684+1225-8321.0884
7474.6
)
= 54.83°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(106.9°))
= arcsin(0.3278·0.9568)
= 18.28°
Периметр:
P = a + b + c
= 91.22 + 106.78 + 35
= 233
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√116.5·(116.5-91.22)·(116.5-106.78)·(116.5-35)
=√116.5 · 25.28 · 9.72 · 81.5
=√2333065.1616
= 1527.4
Высота :
ha =
=
= 33.49
hb =
=
= 28.61