Binh Luc, Peru Geometrico, https://www.facebook.com/photo/?fbid=10228034844329488&set=gm.7197648463681318&idorvanity=400828670030032

 See the drawing and explanation attached.

Best regards.

Training Geometry Olympiad, Naibe Oliveira, https://www.facebook.com/photo?fbid=931182985160309&set=gm.1085609866032659&idorvanity=293155508611436

 My solution attached:

Binh Luc, Peru Geometrico, https://www.facebook.com/photo?fbid=10228018747607080&set=gm.7182812301831601&idorvanity=400828670030032

 Inside the square ABCD there is a square DEFG so that [ABP]=[CGFP]+[AFE].

Proof and drawing, attached.

Geometria Adictiva, https://www.facebook.com/photo?fbid=1402674387057179&set=gm.318464517909665&idorvanity=184162418006543

 See attachment.

Art of problem solving, https://artofproblemsolving.com/community/c6t48f6h3275951_xmxa_if_ltbax2_lt_xba_ltxac2_ltac_x

 Attached, my solution to subject problem