A(1)=5, a(n)= a(n-1)+3 for n > 2

“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 .

(-8,5) bu tun not sure ok