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- Cari besaran sudut A menggunakan aturan kosinus
AD = BD = 4
Cos A = (12² + 8² - 16²)/(2(12)(8))
Cos A = (144 + 64 - 256)/192
= -48/192 = -1/4 (sudut tumpul)
AD² = AC² + AD² - 2(AC)(AD) Cos A
AD² = 12² + 4² - 2(12)(4)(-1/4)
AD = √144 + 16 + 24
AD = √184
AD = 2√46
jadi panjang garis pembagi adalah 2√46