Решение:
Сторона:
a = b·
= 4·
= 4·
= 4·0.366
= 1.464
Угол:
γ° = 180 - α° - β°
= 180 - 15° - 45°
= 120°
Сторона:
c = √a2 + b2 - 2ab·cos(γ°)
= √1.4642 + 42 - 2·1.464·4·cos(120°)
= √2.143 + 16 - 11.71·-0.5
= √24
= 4.899
или:
c = a·
= 1.464·
= 1.464·
= 1.464·3.346
= 4.899
или:
c = b·
= 4·
= 4·
= 4·1.225
= 4.9
Высота :
hc = a·sin(β°)
= 1.464·sin(45°)
= 1.464·0.7071
= 1.035
Периметр:
P = a + b + c
= 1.464 + 4 + 4.9
= 10.36
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√5.182·(5.182-1.464)·(5.182-4)·(5.182-4.9)
=√5.182 · 3.718 · 1.182 · 0.282
=√6.422045511024
= 2.534
Высота :
ha =
=
= 3.462
hb =
=
= 1.267