Create an interface called Geometry with (1) a method called perimeter that has no parameters and returns a double, and (2) a method called area that takes no parameters and returns a double. Assume that Geometry exists in a file called Geometry. java.

Meenu wants to create a high quality drawing in a variety of colours. which device should she use for the same?

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.

The fourth generation of computers emerged between 1970s and 1980s. which technological advancement brought about this generation of computers? which computer architecture was used most in this generation?