maths Q

This is the maths Q that i don't know...

 

In the figure, ABCD is a rectangle of dimensions 6 cm *8 cm. E and F are the mid-pts of BC and AD respectively. BD intersects EF at G.

 

1, Prove that ABGF is a right- angled trapezium.

 

2. Find the area of trapezium.ABGF.

 

Pls help.. THX..

Done