The three facts that are true about the golden mask are:
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Artifacts from this ruler's tomb can be seen in the Cairo museum - The golden mask is commonly associated with Tutankhamun, and many artifacts from his tomb are indeed displayed in the Egyptian Museum in Cairo.
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Artifact is a burial mask - The golden mask is specifically known as a burial mask, which was placed over the face of the mummified body.
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Image is of the ruler who built pyramids of Giza - This statement is not correct for the golden mask. The pyramids of Giza were built by earlier pharaohs such as Khufu, Khafre, and Menkaure, while the golden mask is associated with Tutankhamun, who ruled much later.
Therefore, the only correct true facts about the golden mask are the first two mentioned. The other statements do not accurately apply to the artifact in question.