Ответ:18

Объяснение:κ=,  MK=30·

!!!△ABC и △MKC:

MC/BC = 15/25 = 3/5

KC/AC = 12/20 = 3/5

=> MC/BC = KC/AC; k = 3/5

MC/BC = KC/AC

∠C - общий

=> △ABC ~ △MKC

=> MK/AB = k = 3/5

MK/30 = 3/5

MK = (30 * 3) / 5 = 18

ОТВЕТ: MK = 18