Describe how to determine if two polygons have the same size and shape.

Step-by-step explanation:

Remember that if two figures have corresponding angles congruent, but proportional sides, then those figures are similar.

However, if those figures have corresponding angles and sides congruent, then they are congruent.

Therefore, to determine if two polygons are congruent, that is, in size and shape, we need to prove that their corresponsing sides are all congruents, that way, we'll be able to demonstrate their absolute congruence.

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11