Ответ:
3,14
Пошаговое объяснение:
S =
С = 2r; d
d = C :
d = 6,28 : 3,14 = 2
r = 2 : 2 = 1
S = 3,14 x
S = 3,14 ()
5,8/5=х/4,75
5,8*4,75/5=х
4.75/5 = 0.95
5.8 *0.95 = x
x = 5.51
√25-x+√9-x = 0 => 5-x+3-x=0 => 2x = 8 => x = 4