A scalene triangle has no congruent sides.
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Tracing faces of cubes and rectangular prisms and decomposing cubes and rectangular prisms along their edges helps students understand the set of plane figures related to the solid figure.
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)
Parallel lines lie in the same plane and never intersect. Parallel lines are always the same distance apart and do not share any points. The symbol ∥ indicates that two or more lines are parallel.
An angle is formed by two rays that share a common endpoint called the vertex. Angles are found wherever lines or line segments intersect.