# Math Help - Advanced proof of parallelograms having equal areas

1. ## Advanced proof of parallelograms having equal areas

SOLUTION FOUND. You can extend EF and CB until they intersect.

2. ## Re: Advanced proof of parallelograms having equal areas

If all you are given is that ABCD and DEFG are parallelograms then you can't prove they have the same area- it's not true! It is not true that all parallelograms have the same area. What properties of ABCD and DEFG are you given that you haven't mentioned?

3. ## Re: Advanced proof of parallelograms having equal areas

Originally Posted by HallsofIvy
What properties of ABCD and DEFG are you given that you haven't mentioned?
Well, the picture shows obviously that $A\in EF$ and $G\in CB$.