Give an example from your classroom of three collinear points

Need on this one asap im almost done with this subject

Which of these triangle pairs can be mapped to each other using two reflections?

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2