Will mark brainlist if right

The answer is part a: use

“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 .

1/5 i hope this

You need to include the original coordinates of the triangle to answer this. and how much does it translate (move left right up down)