Ayudeme porfabor se los agradeceria mucho :)​

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Based on the diagram, match the trigonometric ratios with the corresponding ratios of the sides of the triangle. tiles : cosb sinb tanb sincposs matches: c/b b/a b/c c/a

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost