In this figure AB ∥ DC. Write two pairs of triangles having the same area.
Area of triangles on the same base and between same parallels are equal.
Hence
△ADB and △ACB have equal areas.
△DCA and △DCB have equal areas.
In this figure, ABCD is a trapezium in which AB || DC and AB = 3DC. Determine the ratio of the areas of △ AOB and △COD.
In the given figure, AB // EF // DC; AB = 67.5 cm, DC = 40.5 cm and AE = 52.5 cm. (i) Name the three pairs of similar triangles. (ii) Find the lengths of EC and EF.