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Ab=4k
Ac=3k
15²=(3k)²+(4k)²
225=9k²+16k²
25k²=225
K²=225/25
k²=9
k=3
Ab=4*3=12
Ac=3*3=9
PΔ=12+9+15=36 cm
sinB=Ac/15=9/15=3/5
cosB=Ab/15=12/15
ctgB= 4/3