What is this area? please help

In the surface area formula for cylinders which expressionrepresents the lateral area

What is not true about kl and mn? what is mn? (show )

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?