MODULE2 ● POSTER 4
ANGLESANDREGULARPOLYGONS:HOWMUCHTOTURN?
exteriorangleinteriorangleexternalsupplementaryangle
supplementaryanglesarepairsofangles
whichaddupto180°
TodrawapolygontheBeetleneedstoturnbythe
externalsupplementaryangle.Youcancalculate
thisbycalcula>ngthedifferencebetweenthe
interiorangleofyourpolygonand180°
totalturn360°isthesumofallexternal
supplementaryangleswhendrawinga
regularpolygon