Find the measure of each numbered angle

Mary works for a company that ships packages and must measure the size of each box that needs to be shipped. mary measures a box and finds the length is 7 inches, the width is 14 inches, and the height is 15 inches. what is the volume of the box? [type your answer as a number.]

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the distance between point a and b