Diketahui AD = 12 cm dan BD = 9 cm. Hitunglah panjang AB, CD dan AC

AD² = BD x CD
12² = 9 x CD
144 = 9 CD
CD = 144 / 9
CD = 16 cm

AB² = BD x BC
AB² = 9 x 25
AB² = 225
AB = √225
AB = 15 cm

AC² = CD x BC
AC² = 16 x 25
AC² = 400
AC = √400
AC = 20 cm