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30cm2 =1/2 x 12 x t
=1/2 x12
30cm2 =6 x t
t =30/6
=5
sm2=s.siku2+s.siku2
=12(pangkat 2)+5(pangkat dua)
=144+25
=169
=169 akarnya 13
k.segitiga=a+b+c
=13+12+5
=50