Canis Major, often called The Great Dog. Sirius is sometimes called The Dog Star.
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Sirius is the brightest star in the constellation Canis Major ("the Greater Dog" or "the Big Dog").
The North Star, or Polaris, is at the end of the handle part of the Little Dipper constellation otherwise known as Ursa Minor.
There are three straight edges in a triangle.
If the lines are straight then it IS a triangle.
A plane figure with three straight sides and three angles.
Three straight lines meeting, pairwise, at three points (vertices).
A triangle is a two dimensional shape with three straight lines and three vertices. A sphere is a three dimensional object with no straight lines and no vertices and such that every point on its surface is a constant distance from a fixed point. It is not possible to have a triangle sphere.