A∩(B−C) =( A∩B) −( A∩C) Esto es Teoría de conjuntos. Debo sacar los diagramas de venn con esta problema y decir si cumple o no con la igualdad.

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7