Задача 75599 ...
Условие
�
=
7
a=7,
c= 79
4A≈43°.
математика 8-9 класс
490
Решение
★
a/sin A = b/sin B = c/sin C
sin C = c/a*sin A = sqrt(79)/7*sin 43° ≈
≈ 8,8882/7*0,682 ≈ 0,866 = sqrt(3)/2
C = 60°
B = 180° - A - C = 180° - 43° - 60° = 77°
b = a*sin B/sin A = sqrt(79)*sin 77°/sin 43° ≈
≈ 8,8882*0,9744/0,682 ≈ 12,7 ≈ 13