If by P=5ft you mean the radius is 5 then c = 2pi r or c = 10pi or approx 31.4 ft
For congruence of triangles.
If;

Then the corresponding sides and angles will be equal.

Only the above congruence statements are true.
Any options that has any of the above congruence statement is true.
Step-by-step explanation:
price difference= $45-$36
=$9
now,
x% of $45=$9
or, x/100 ×45 =9
or, x/20 ×9=9
or, x/20=1
therefore, x= 20%