9 см
Объяснение:
sin(a)^2 + cos(a)^2 = 1
cos(a)^2 = 1 - sin(a)^2
(√11/6)^2 = 1-sin(a)^2
sin(a)^2 = 1 - 11/36
sin(a) = √25/36
sin(a) = 5/6
15/6 = 2r
2r = 15/6 * 6
2r = 6*3
r = 9
9 см
Объяснение:
sin(a)^2 + cos(a)^2 = 1
cos(a)^2 = 1 - sin(a)^2
(√11/6)^2 = 1-sin(a)^2
sin(a)^2 = 1 - 11/36
sin(a) = √25/36
sin(a) = 5/6
15/6 = 2r
2r = 15/6 * 6
2r = 6*3
r = 9