Answer:
2x +21
Step-by-step explanation:

Answer:
You have two sets of parallel sides. A square has two sets of parallel sides, and it has the extra condition that all of the angles are right angles. So a square is definitely going to be a rhombus. Now, all rhombuses have four sides.
Step-by-step explanation:
Answer:
9
Step-by-step explanation:
3*3 =9