11.it is the sum of the interior angle of regular pentagon.
a.180° b.540° c.900° d.1080°
12.how many sides does a regular heptagon has?
a.5 b.6 c.7 d.8
13.the sum of exterior angles of a regular polygons is ____?
A.180° B.540° C.360° D.1080°
14.determine the polygon whose sum of its interior angles 1080°?
a.hexagon
b.heptagon
c.octagon
d.decagon
15.the sum of exterior angles of a decagon ?
A.180° B.540° C.360° D.1080°
16.which is considered a four-side polygon?
a.octagon
b.pentagon
c.rhombus
d.traingle ​