2
ٸǰ ڸƮ ۼڿ ٸǰ ȸ -1-2-3 ްԵ˴ϴ.
D
d ϰ ִ°ź c ڱ ˰
ѵ ħ, C , ̾ B , D A - ״ .
3 ڳ. A D ϴ 1/2Ȯ
ȱ C
Ͻ ؼ ϳ ߸ ٸ ̶
Ѹ ְ ˴ϴ.
弳, ó ִ ﰡּ.
ٸǰ Խñ ۼڿ ٸǰ ȸ -1-2-3 ްԵ˴ϴ.