Square RSTU shown above is rotated in a plane about its center in a clockwise direction the minimum number of degrees necessary for U to be in the position where R is now shown. The number of degrees through which RSTU is rotated is  Answers.
A) 135 degree
B) 180 degree
C) 90 degree
D) 270 degree
E) 315 degree
From the options, I am assuming the positioning of R and U relative to each other to be as shown. To replace R by U, focus on OU. Say, you rotate OU clockwise (and with it the entire square) and bring it in place of OR. How many degrees did you go? You covered 1 right angles i.e. 90 degrees.   Answer : 90 degree
<result>C</result>
Square RSTU shown above is rotated in a plane about its center in a clockwise direction the minimum number of degrees necessary for U to be in the position where R is now shown. The number of degrees through which RSTU is rotated is