Let the number of sides in polygons be 5x and 4x, respectively.
Interior angle of a regular polygon having n sides
=∴−=9⇒180x−72−(180x−90)=9x⇒x=2Number of sides are 10 and 8,respectively.
Therefore, one polygon is a decagon and the other one is an octagon.
The sum of exterior angles of a polygon = 360°.
Therefore, the sum of exterior angles in two polygons
=360°+360°=720°.Hence, statements 2 and 3 are correct.