Polygons

2010018004

Level: 
C
A rectangle-shaped land has dimensions 5×8cm on a map with scale 1:500. The owner increased the size of his land by buying some land from his neighbor. The new land has dimensions 7×9cm on the map. Find the actual increase of the perimeter of the land (i.e. find the increase in the length of the fence required to enclose the whole land). Give your answer in meters.
30m
15m
40m
60m

2010018002

Level: 
B
In the figure the cut of a regular polygon with unspecified number of vertices is shown. The red angle is the central angle of the polygon, the blue angle is the interior angle of the polygon. Suppose we consider a regular polygon with the central angle of 30, then find the measure of the interior angle of this polygon.
150
180
90
210