pen·ta·gon /ˈpɛntəˌgɑn/
五角形,五邊形
Pen·ta·gon n. Geom. A plane figure having five angles, and, consequently, five sides; any figure having five angles.
Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.
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Pentagon
n 1: a government building with five sides that serves as the
headquarters of the United States Department of Defense
2: the United States military establishment
3: a five-sided polygon