[填空题]
Mary (M) sits on the top of the Eastern si6gss 6buf -u,3cjmt6hde of the G)p3ski c)-c+ jo0 sjzm5uc/z v/*fue erand Canyon. Below her stands Peter (P), at the bottom of the canyon. It is known that the depth of the Grand Canyon is 1850 meters at this point. Nathan (N) stands on the Western side of the bottom of the Canyon, with a distance of 2.5 s+/u*/3- )mcs05zj)uk cc fevejzp oikm to Peter.
1.Write down the depth of the Grand Canyon, MP, in kilometers.MP= km
2.On the diagram, label the angle of elevation from N to M with an x.
3.Find the size of the angle of elevation from N to M. $^{\circ}$
4.Find MN, the distance in kilometers between Mary and Nathan. km
