An obtuse triangle has one obtuse angle.
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The edge is the line segment where two faces of a solid figure intersect.
A circle is the set of points in a plane that are the same distance from a point called the center.
Recognize that rectangles and squares have special types of angles called right angles. (a)
An angle is formed by two rays that share a common endpoint called the vertex. Angles are found wherever lines or line segments intersect.
A right angle measures exactly 90 degrees.