Need help badly

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?