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17=a²+15²
289-225=a²
64=a²
a=64
a=√64=8
berdasarkan rumus luas segitiga
L=a×t/2
=15x8/2
=120/2
=60
jadi luas segitiga 60cm
luas = 1/2 x a x t
= 1/2 x 8 x 15
= 4 x 15
= 60 cm²
jawabnya 60 cm²