试解
monseigneur
2024-01-21 11:01:10
( reads)
Triangle ABO is isosceles. Angle AOB=360-(90+30+3*180/5)=132. So angle ABO=(180-132)/2=24. Angle ABC=24+30=54.
Triangle ABO is isosceles. Angle AOB=360-(90+30+3*180/5)=132. So angle ABO=(180-132)/2=24. Angle ABC=24+30=54.
yma16
2024-01-21 16:15:16很好