a On an FCC unit cell draw the 111 plane and showlabel three

a.) On an FCC unit cell, draw the (1-11) plane and show/label three valid slip systems on that plane.

b.) Derive the size of an octahedral interstitial site in an ideal FCC matrix as a function of the size of the host atom (derive the r/R ratio). Indicate on the figure the location of one of those interstitial sites in the unit cell.

These are two separate problems. I am writing answer to the first problem as per chegg guidelines.