Question

6) задание................................

Answer 1

4/АВ = SinA
Sin²A = 1 - Cos²A = 1 - 26/676 = 650/676
SinA = 5√26/26
4/АВ = SinA
4/АВ = 5√26/26
АВ = 4*26/5√26 = 4√26/5
АС ищем по т. Пифагора
АС² = 16*26/25 - 16 = 16/25
АС = 4/5 = 0,8