I've always used a triangle, and I've never had a problem with the entities I've summoned becoming belligerent or hostile. They understand the rules and comply with them.
That having been said: I also draw the triangle on the ground with chalk outside the circle. It's like a double or triple clear glass wall. Think of it like bulletproof glass at the bank and you pretty much get the idea. I'll also draw the sigil of the entity inside the triangle with chalk, and place a paper sigil (if I need one) on top of that. That way they're automatically summoned *inside* the triangle, I don't have to force them to go anywhere, and they can't wander around either. Then, when I'm done, I just hose down the patio and both the triangle and sigil are gone, thereby releasing the entity to do whatever it was that I asked them to do.
I also try to be respectful to the entity within the triangle, and won't push them around or curse them unless they really don't want to do what they're told. I've never had a problem with that though.
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As the water grinds the stone, We rise and fall As our ashes turn to dust, We shine like stars... --Covenant, "Bullet"
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