In Fig.9.28, AP || BQ || CR. Prove that:
ar (AQC) = ar (PBR)
Since ΔABQ and ΔPBQ lie on the same base BQ and are between the same parallels AP and BQ
Area (ΔABQ) = Area (ΔPBQ) (i)
Again, ΔBCQ and ΔBRQ lie on the same base BQ and are between the same parallels BQ and CR
Area (ΔBCQ) = Area (ΔBRQ) (ii)
On adding equations (i) and (ii), we obtain
Area (ΔABQ) + Area (ΔBCQ) = Area (ΔPBQ) + Area (ΔBRQ)
Area (ΔAQC) = Area (ΔPBR)