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AC² = AD² + DC²
AC² = 16² + 12²
= 256 + 144
= 400
dari Δ ABC
AC² = AB² + BC²
400 = x² + 14²
400 = x² + 196
x² = 400 - 196
x² = 204
x = √204
= √4 .√51
= 2√51 cm
x = √20² - 14² = √400 - 196 = √204 = √4 . 51 = 2√51 cm
maaf klo salah :) semoga membantu ^^