Is the square root of 81 a rational number and a integer

Which of the following statement about pascal's triangle are true?

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

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)