[填空题]
Mary (M) sits on the to3s 8/d7fx xeuk9cx *ctp o(po ydz/1 hbw+v c.alyc7 9.opf the Eastern side of the 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 meters at this point. Nathav b+yz p.o.1/o dyp(wc9cl7ahn (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
