Shown is a square garden with a triangular pond.
Find the area of the garden that is grass

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

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Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?