Can someone answer! there is a picture. it's just one question !

Its C x2+y2=4

Explanation: the reason why it equals 4 in the radius is beacuse y and x coordinates are opposits leading the x2 and y2 to intersect into a regular 4.

hope my explanation helps u understand the question

“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 .