A record for free-fall to the ground without a parachute is 311 ft. How long did the fall take? Use formula s=16t^2

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

How do you find the circumfrance of a circle?

With finding limits of multi variable !