5.3.2.17 Various Problems in the Space

Condition: Find the distance between the vertices \ (b \) and \ (d_ {1} \) rectangular parallelepiped \ (a b c d a_ {1} b_ {1} c_ {1} d_ {1} \), for which \ (a b = 4 \), \ (a d = 3, a a_ {1} = 7 \))