Date: Sat, 5 Apr 1997 14:29:44 +0800 (HKT)

From: Calvin, Lui Lai Kiu

Dear Alexander,

Hi ,I am Ronald.I have a mathematics question that I don't know how to solve.The question is as following:

Area of trapezium ABCD is 34 cm sq. where AD // BC, E and F are two point on the line AB such that AE =BF.CE intersects DF at O.If the area of triangle OCD is 11cm sq. ,find the sum of the area of triangle OED and triangle OCF.

I try to make a line through O where the line // to AD,but it cannot be found.i have also tried to let A(x,y) ,B(a,b) .........etc and solve,but it cannot be found,too.Could you please help me to solve it?

Thank you very much.

From,Ronald.