= 12√8/8
= (12 √4 . 2)/8
= 12.2 √2/8
= 3√2 cm
Baca Juga: Kunci Jawaban Matematika Kelas 9 SMP Halaman 303 304 305 Latihan 5.3 Bola, Semester 2 1-10 Lengkap
*) 2πr2 (t2 + r2) = L2
2πr2 (3√2 + r2) = 12π
3√2r2 + r22 – 6 = 0
r22 + 3√2r2 – 6 = 0
a = 1, b = 3√2, c = -6