gimana caranya plis donk kakak

[tex] {bc}^{2} = cd \times ca \\ {bc}^{2} = 12 \times 16 \\ {bc}^{2} = 192 \\ bc = \sqrt{192} \\ bc = \sqrt{64 \times 3} \\ bc = \sqrt{64} \sqrt{3} \\ bc = 8 \sqrt{3} [/tex]
Jawaban ny yg D

Semoga dapat dipahami