# Distance Formula

1. $\rhd$ Distance Fomula (9:38)
Find the distance between $(3,-4)$ and $(6,0)$ using the distance formula by deriving it from the Pythagorean Theorem.Then Sal uses the formula he derived to compute the distance between $(-6,-4)$ and $(1,7)$.  In this example he uses an on-screen TI graphing calculator.
2. $\star$ Use the Pythagorean Theorem (distance formula) to find the distance between two points in the plane.
3. $\rhd$ Really nice application!  Thiago (Brazillian soccer player) asks: How long does a keeper have to react to a penalty kick? (12:04)