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1.ABCD-patrulater convex
∡A=45°
∡B=63°
∡C=143°
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∡D=?


2.ABCD-patrulater convex
∡A=90
{∡B,∡C,∡D}dirct proportional cu {5,6,7}
∡A,∡B,∡C,∡D=?


ABCD-parulater convex
PERIMENTRUL ABCD=100
PERMINTRUL=ABC=60
AC=16
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PERMINTRUL=ABCD ?



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