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Caranya
⇒ 12² + 5²
⇒ 144 + 25
⇒ 169
√169 = 13
Keliling = BC + CA + AB
Keliling = 12 cm + 13 cm + 5 cm
Keliling = 30 cm
5²+12²=c²
25+144=c²
169=c²
c=√169
c=13
5+12+13= 30 cm