jika pada segitiga abc diketahui b = 3 cm , c = 6cm dan

⇒Gunakan aturan cos
a² = b² + c² - 2bc cos A
a² = 3² + 6² - 2(3)(6) cos 60
a² = 45 - 36 × 1/2
a² = 45 - 18
a² = 27
a = 3√3 cm

[tex]\text{ATURAN COSINUS}\\\\\text{a}^2 = \text{b}^2 + \text{c}^2 - 2\text{bc Cos A}\\\text{a}^2 = \text{3}^2 + \text{6}^2 - 2(\text{18})\text{Cos 60}\\\text{a}^2 = 9 + 36 - 18\\\text{a} = \sqrt{27}\\\text{a} = 3 \sqrt{3}\,\,\text{cm} [/tex]

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