[tex]{\sf{1. \: ) \: luas \: permukaan \: segitiga \: sama \: kaki = \: \frac{1}{2} \: \times \: a \: \times \: t} }[/tex]
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[tex]{\sf{1.) \: \frac{1}{2} \: \times \: a \: \times \: t }}[/tex]
[tex]{\sf{ = \: \frac{1}{2} \: \times \: 12 \: \times \: 15}}[/tex]
[tex]{\sf{ = \: \frac{1}{2} \: \times \: 180 }}[/tex]
[tex]{\sf{ = \: (180 \: \div \: 2) \: \times \: 1}}[/tex]
[tex]{\bf{ = \: 90 \: \times \: 1}}[/tex]
[tex]\boxed{\sf{{ \bf{ = \: \boxed{\sf{{ \bf{90 }}}}}}}}[/tex]
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[tex]{\sf{1. \: ) \: luas \: permukaan \: segitiga \: sama \: kaki = \: \frac{1}{2} \: \times \: a \: \times \: t} }[/tex]
______________________________________________________
[tex]{\sf{1.) \: \frac{1}{2} \: \times \: a \: \times \: t }}[/tex]
[tex]{\sf{ = \: \frac{1}{2} \: \times \: 12 \: \times \: 15}}[/tex]
[tex]{\sf{ = \: \frac{1}{2} \: \times \: 180 }}[/tex]
[tex]{\sf{ = \: (180 \: \div \: 2) \: \times \: 1}}[/tex]
[tex]{\bf{ = \: 90 \: \times \: 1}}[/tex]
[tex]\boxed{\sf{{ \bf{ = \: \boxed{\sf{{ \bf{90 }}}}}}}}[/tex]