What is so fragile that saying its name breaks it?

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

In the image below, can you find the value of an angle(y)

Eight of us go fourth, not back, to protect our king from an attack. What are we?

People make me, save me, change me, raise me. What am I?

What work can one never finish?

I am quite hot but become too cold if you remove the first two letters. What am I?

What you cannot hold but it is yours?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?