[tex]sisi \: b = sisi \: c \\ \sqrt{(a \div 2) {}^{2} + {t}^{2} } \\ \sqrt{(12 \div 2) {}^{2} + {8}^{2} } \\ \sqrt{ {6}^{2} + {8}^{2} } = \sqrt{36 + 64} \\ \sqrt{100} = 10 \\ \\ keliling \: segitiga \\ sisi \:a + sisi \: b + sisi \: c \\ 12 \: cm + 10 \: cm + 10 \: cm \\ 32 \: cm \: (C)[/tex]
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[tex]sisi \: b = sisi \: c \\ \sqrt{(a \div 2) {}^{2} + {t}^{2} } \\ \sqrt{(12 \div 2) {}^{2} + {8}^{2} } \\ \sqrt{ {6}^{2} + {8}^{2} } = \sqrt{36 + 64} \\ \sqrt{100} = 10 \\ \\ keliling \: segitiga \\ sisi \:a + sisi \: b + sisi \: c \\ 12 \: cm + 10 \: cm + 10 \: cm \\ 32 \: cm \: (C)[/tex]