[b]Step 1:[/b] Click on the circle icon, then construct a circle with center A and radius AB.  (Click on A to select the center, then click on the B to select the radius)[br][b]Step 2:[/b] Duplicate the exact same circle by clicking on the circle icon, then compass.  Then click on the circle you want to duplicate, then click on point C to copy it.[br]Now we have two congruent circles, one with center A, and the other with center C.  Both have the same radius)[br][b]Step 3: [/b]Click the intersection icon (the 2[sup]nd[/sup] one), then click on the circle around C and then the green line.  This will mark that intersection with a point.  (We want to use the intersection tool here and not the point tool so it goes to the exact point we want).[br][b]Step 4:[/b] Click on the line tool (the 3[sup]rd[/sup] one), and click on segment as the directions state. [br]Construct a segment between C and the new intersection point you created in step 3. (Click on C, then click on the new point)[br][b]Step 5:[/b] If you did it correctly, a “Nailed it!” should pop up letting you know you did it right![br][br]