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# 1

Pilgan

Perhatikan gambar berikut

$cos A = . . . .$

$cos A = \frac{3 ^{2} + 4 ^{2} - 2 ^{2}}{2 . 3 . 4}$

$cos A = \frac{4 ^{2} + 3 ^{2} - 4 ^{2}}{2 . 3 . 4}$

$cos A = \frac{2 ^{2} + 4 ^{2} - 3 ^{2}}{3 . 3 . 4}$

$cos A = \frac{3 ^{2} + 4 ^{2} + 2 ^{2}}{2 . 3 . 4}$

$cos A = \frac{2 ^{2} + 4 ^{2} + 3 ^{2}}{2 . 2 . 4}$