In the rectangle ABCD, O is any point inside the rectangle. If area( ΔAOD) = 30 cm2 and area( ΔBOC) = 60 cm2, area of the rectangle ABCD is
(in cm2)
Draw a line through O parallel to AD as shown.Parallelogram APQD and triangle AOD are on same base AD and between same parallels.So, Area(AOD)=12Area (APQD)Area (APQD)=60cm2Parallelogram PBCQ and triangle BOC are on same base BC and between same parallels.So, Area (BOC)=12Area (PBCQ)Area (PBCQ)=120cm2Area (ABCD)=Area (APQD)+Area (PBCQ)=180cm2