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AC=
√144-64
√80
√16*√5
4√5 cm
Cos A =AC/AB
=4√5/12
=1/3√5 Atau √5/3
Maaf kalau salah
Trigonometri
AC = √(AB² - BC²)
AC = √(12² - 8²)
AC = √(144 - 64)
AC = √(16 × 5)
AC = 4√5
cos A
= AC/AB
= 4√5 /12
= 1/3 √5