What is the length of a?

so the length of a is 60 yd.

Look at the attached picture

Hope it will help you

Good luck on your assignment..

“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 .

A. is the answer in this question