Решение:
Сторона:
b = √a2 + c2 - 2ac·cos(β°)
= √4202 + 4922 - 2·420·492·cos(70°)
= √176400 + 242064 - 413280·0.342
= √277122.2
= 526.42
или:
b = a·
= 420·
= 420·
= 420·1.879
= 789.18
или:
b = c·
= 492·
= 492·
= 492·0.9542
= 469.47
Высота :
hc = a·sin(β°)
= 420·sin(70°)
= 420·0.9397
= 394.67
Периметр:
P = a + b + c
= 420 + 469.47 + 492
= 1381.5
Площадь:
p =
S =√p·(p-a)·(p-b)·(p-c)
=√690.74·(690.74-420)·(690.74-469.47)·(690.74-492)
=√690.74 · 270.74 · 221.27 · 198.74
=√8223843785.4973
= 90685.4
Высота :
ha =
=
= 431.84
hb =
=
= 386.33