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This question already has an answer here:

I have a cone and I want to cut of top piece of it. How can I make cut face flat?

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marked as duplicate by gandalf3, Ray Mairlot, user7952, iKlsR Jan 17 '15 at 22:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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In orthographic mode Numpad-5 invoke the knife tool K, press C for angle constrained, and Z for cut through. Space or Enter to confirm the cut.

After that you only need to remove the vertex on the tip.

enter image description here

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While this is a duplicate question, I see no answer that deals with using the operator settings to do this in one step. So, one way would be to just add a cone primitive to the scene. Add > Mesh > Cone and increase the Radius 2 slider.

enter image description here

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You can do this very simply. Add a cube, and position it above your cone. Then put a Boolean modifier on your cone like in the image below, making sure that the Boolean modifier is set to difference. You can apply the modifier like this, or simply leave it how it is.

enter image description here

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