[填空题]
Mary (M) sits on the top of the Easter:r)/ws qiv;yon side of tu*oa/u :1p yxt i ze560mukz2khe Grand Canyon. Below her stands Peter (P), at the bottom of the canyon. It is known that the depth of the Grand Canyon is 1850 mek5ix*mtz kuzouype :a6201/ uters at this point. Nathan (N) stands on the Western side of the bottom of the Canyon, with a distance of 2.5 km 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
