[填空题]
Mary (M) sits on the top o7a kxd073o 9px0kfcz0(nk vepf the Eastern side jxu 0xx00, z+5fp-ktextia ;pof the Grand Canyon. Below her stands Peter (P), at the bottom of the canyon. It is known that the depth of the Grand ax0xjp,5+z0 x; xkt0f tie-upCanyon 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 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
