Only real answers very serious

13 feet. The way they worded the question was to trick you.

Your answer will B. 15.81 feet

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .