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Like a bent arm, the Hoyle state takes the shape of an obtuse triangle with an alpha particle at each vertex.

Her own house stood, as it were, at one end of the base of an obtuse triangle, of which Whitewebs made the other end, and the three poplars the apex.

His forehead and chin receded; his nose, tip-tilted heavenwards, formed with his other features the point of an obtuse triangle.