What is the scale factor plz help plzz

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Given that s is the centroid of triangle mno, find sq.

The curved part of the figure is the semicircle what is the best approximation for the area of this figure