Good Riddles

Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?

Question: I have all of your knowledge but could fit in your hands.

What am I?

Question: At school Joe has three friends: Tim, George and Paige. Two of them play football, two play tennis, and two play golf. The friend who doesn't play golf doesn't play tennis and the one who doesn't play football doesn't play golf. Which sports does each person play?

Question: What has to be broken before you can use it?

Question: You use a knife to slice my head and weep beside me when I am dead.

What am I?