Решение:
Сторона:
a = √b2 + c2 - 2bc·cos(α°)
= √122 + 82 - 2·12·8·cos(95.08°)
= √144 + 64 - 192·-0.08855
= √225
= 15
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(95.08°))
= arcsin(0.8·0.9961)
= 52.83°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(95.08°))
= arcsin(0.5333·0.9961)
= 32.09°
Периметр:
P = a + b + c
= 15 + 12 + 8
= 35
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√17.5·(17.5-15)·(17.5-12)·(17.5-8)
=√17.5 · 2.5 · 5.5 · 9.5
=√2285.9375
= 47.81
Высота :
ha =
=
= 6.375
hb =
=
= 7.968
hc =
=
= 11.95