Cho tam giác ABC có góc  = 90 0 , đường cao AH. Gọi M, N là trung điểm của AB và AC. Chứng minh rằng MH vuông góc với NH.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

nations must cooperate to bring about and maintain world peace.

nations must not wage wars or commit war crimes in a desire to control other nations.

i think i know which options you have but if these aren't options let me know

this is true hope this

!

true, they can both only can be studied with ancient text.