Example 15! 
Show calci by drawing diagonal AC, not BD, please!

E x a m p l e   15   :         I f   A ( - 5 ,   7 ) ,   B ( - 4 ,   - 5 ) ,   C ( - 1 ,   - 6 )   a n d   D ( 4 ,   5 )   a r e   t h e   v e r t i c e s   o f   a   q u a d r i l a t e r a l ,   f i n d   t h e   a r e a   o f   t h e   q u a d r i l a t e r a l   A B C D   .

Is this right?

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