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a=x+2
s=4x+1
K=t+a+s
30=(4x)+(x+2)+(4x+1)
30=9x+3
30-3=9x
27=9x
x=27/9
x=3
a=x+2=3+2=5 cm
t=4x=4(3)=12 cm
Luas = ½at=½×5×12=30 cm²
Jadi luas ∆ adalah 30 cm²