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Kelas 10 MatematikaBab Trigonometri
cos C = (AC² + BC² - BC²) / (2 . AC . BC)
cos C = ((4√3)² + 6² - (2√3)²) / (2 . 4√3 . 6)
cos C = (48 + 36 - 12) / (48 √3)
cos C = 72/(48 √3) . (√3)/(√3)
cos C = (3 √3)/(2 . 3)
cos C = 1/2 √3
C = 30°