The edges of a cuboid are respectively 3cm, 4cm and 12 cm. Find the length of the diagonal of cuboid.	Pick one: A) 9: 8 B) 9: 5 C) 9: 1 D) 9: 2 E) 9: 4
a1 : a2 = 3 : 1   6 a12 : 6 a22 = 9: 1   Answer:9: 1
<result>C</result>
The edges of a cuboid are respectively 3cm, 4cm and 12 cm. Find the length of the diagonal of cuboid.