Can someone help me on this?

I think it’s a because 10^7 is 10,000,000 and 10^3 is 1000 and if you divide it both you get 10,000 or number a technically. so it’s A

“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 .