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a/b=3/4
4a=3b
a=3/4b
42=2(3/4b)+2b
42=3/2b+2b
42=7/2b
b=42*2/7
b=12 cm
a=3/4*12
a=9 cm
d=√(a²+b²)
d=√(9²+12²)
d=√(81+144)
d=√225
d=15 cm