б( ) ϱǿɳȯ( 賲ȣ) 4ȸ ɳȯ ȯ ߴ.
ǿɳȯ ְƷ ط 4ȸ° ȯ ȯ ȯ ġḦ Ұų ġ ȯڿ ȣڸ 8 1Ϻ 9 30ϱ Ⱓ ټ ǰ ɻ縦 Ϸϰ 12 ڸ ߴ.
̹ ڴ ϻȰ ٸ硱 θ ȾҰ ֿ ð ̴١, ڸ к 2 λ ϴ١ Ǿ ̸ 4 ߴ.
賲ȣ ϱǿɳȯ ġ ϸ鼭 ̰ Ŭ ŭ 뽺 ̰ܳ ĵ鿡 ؼ " " ̷ ȯڵ 鿡 Ǿ ڴ١ Ұ ߴ.
4ȸ ɳȯ ȯ û 12 ܷ1 밭翡 ̸ 缱 ۵Ǿ ȴ.