AC² = AB² + BC² - 2 AB BC cos 120
AC² = 15² + 21² - (2)(15)(21)(-1/2)
AC² = 225 + 441 + 315
AC = √981 m
a. banyaknya pohon = √981/√37
= √26,5... (dibulatkan)
= 5
b. harga: 5 x 50.000 = 250.000
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AC² = AB² + BC² - 2 AB BC cos 120
AC² = 15² + 21² - (2)(15)(21)(-1/2)
AC² = 225 + 441 + 315
AC = √981 m
a. banyaknya pohon = √981/√37
= √26,5... (dibulatkan)
= 5
b. harga: 5 x 50.000 = 250.000