The embankment in the following Figure is made up from a soil with = 20 and c = 20kN/m. The soil on which the embankment sits has a p of

7 and c = 75 kN/m. For both soils y= 19.3 kN/m. Determine the factors of safety for the two slip circles shown in the following Figure, byusing two different methods: 1- Hand calculation, 2- Computer software GeoSlope