In a diagram of triangle PRT, Q is a point on line PR, S is a point on line TR, line QS is drawn, and angle RPT is congruent to angle RSQ. Which reason justifies the conclusion that
triangle PRT is similar to triangle SRQ.
1) AA
2) ASA
3) SAS
4) SSS

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.