Which diagram shows that the two triangles must be congruent? a. 2 only
b. 1 and 2 only
c. 1 and 3 only
d. 2 and 3 only

The answer maybbe c

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c