Find the value of x in these Complementary Angles

Could somebody me with this radical simplification?

Write a ratio and a percent for the shaded area. it is 3x3 and 5x5 grid there is 6 shaded out of a. 6 over 25 , 30% b. 3 over 50 , 6% c.6 over 25 , 24% d. 3 over 10 , 30%

Identify the number as a rational or irrational. explai. 291.87