Grant would swim three the middles of the pool (just doing this for the points)
I just did on a calculator, I hope it helped a littler
Each is 7 long and the whole piece is 56 so we can make 8 down the length and each is 1 wide and the whole things is 3 so that makes 3 across. we multiply these to get 8*3= 24
If this an angle on a straight line the answer is k=73°