Решение:
Сторона:
a = √b2 + c2 - 2bc·cos(α°)
= √42 + 42 - 2·4·4·cos(90°)
= √16 + 16 - 32·0
= √32
= 5.657
Угол:
β° = arcsin(
sin(α°))
= arcsin(
sin(90°))
= arcsin(0.7071·1)
= 45°
Угол:
γ° = arcsin(
sin(α°))
= arcsin(
sin(90°))
= arcsin(0.7071·1)
= 45°
Периметр:
P = a + b + c
= 5.657 + 4 + 4
= 13.66
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√6.829·(6.829-5.657)·(6.829-4)·(6.829-4)
=√6.829 · 1.172 · 2.829 · 2.829
=√64.054643628708
= 8.003
Высота :
ha =
=
= 2.829
hb =
=
= 4.002
hc =
=
= 4.002