Jawab:
a² = b² + c² - 2 bc cos a
a² = 8² + 5² - 2 (8)(5) cos 60°
a² = 64 + 25 - 80 x 1/2
a² = 89 - 40
a = √49
a = 7 cm
Jadi panjang a adalah 7 cm
a² = b² + c² - 2.a.c.cos 60°
a² = 8² + 5² - 2.8.5 .1/2
a² = 64 + 25 - 40
a² = 49
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Jawab:
a² = b² + c² - 2 bc cos a
a² = 8² + 5² - 2 (8)(5) cos 60°
a² = 64 + 25 - 80 x 1/2
a² = 89 - 40
a = √49
a = 7 cm
Jadi panjang a adalah 7 cm
a² = b² + c² - 2.a.c.cos 60°
a² = 8² + 5² - 2.8.5 .1/2
a² = 64 + 25 - 40
a² = 49
a = √49
a = 7 cm