Hello, abrogard!

I'm not laughing . . . This was tricky.

There's a quadrilateral ABCD:

Angles and are bisected. .The bisectors intersect at

FindThe angles of a quadrilateral total 360°.Code:A o * * * * * * o D * * 120° * * * * * * T o * * * * * * * * * * * * * * * * * 50° * B o * * * * * * * o C

. . Hence: .

Since we have: .

. . Hence: . .[1]

In quadrilateral

Since

. . we have: .

. . or: .

Substitute [1]: .