When is a rectangle a square?

I think option B i.e. when its angles are right angles.

Abscissa is the other term of x axis and ordinate is the other term for y axis. The product is defined as the answer from numbers that are multiplied. Since it is said that the numbers are multiplied, therefore x is multiplied by y to get the product which is ten. So the correct answer that would represent the given statement above is option A. xy= 10. Hope that helps!