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l = 5 cm
jawab ; K = 2 x (p + l )
= 2 x (13 + 5 )
= 2 x 18
= 36 cm
CB²=AB²+AC²
13²=5²+AC²
169=25+AC²
169-25=AC²
144=AC²
√144=AC
AC=12 cm
Kll Δ = AB+BC+AC
=13+12+5
=30 cm