MathDB

Through points

A

and

B

two oblique lines

m

and

n

are drawn perpendicular to the line

AB

. On line

m

the point

C

(different from

A

) is taken, and on line

n

the point

D

(different from

B

) is taken. Given the lengths of segments

AB = d

and

CD = l

and the angle

\varphi

formed by the oblique lines

m

and

n

, calculate the radius of the surface of the sphere passing through the points

A

B

C

D

Problem Statement