Решение:
Сторона:
a = 2b·cos(β°)
= 2·197.5·cos(51°)
= 2·197.5·0.6293
= 248.57
Угол:
α° = 180° - 2·β°
= 180° - 2·51°
= 78°
Высота :
h = b·sin(β°)
= 197.5·sin(51°)
= 197.5·0.7771
= 153.48
Площадь:
S =
√4· b2 - a2
=
√4· 197.52 - 248.572
=
√4· 39006.25 - 61787.0449
=
√156025 - 61787.0449
=
√94237.9551
= 19076.6
Радиус вписанной окружности:
r =
=
·
√2·197.5-248.57
2·197.5+248.57
=124.29·√0.2275
= 59.28
Радиус описанной окружности:
R =
=
197.52
√4·197.52 - 248.572
=
=
= 127.06
Периметр:
P = a + 2b
= 248.57 + 2·197.5
= 643.57