Reflect H’ I’ J’ K’ over the y-axis, then rotate it 180 degrees about the origin. The vertices of the image will be called H” ,I” ,J” and K” .

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.