Congruent
Exactly equal in size and shape. Congruent sides or segments have the exact
same length. Congruent angles have
the exact same measure.
For any set of congruent geometric
figures, corresponding
sides, angles, faces,
etc. are congruent.
Note: Congruent segments, sides, and angles are often marked.
Congruent Segments 
Congruent Angles 
All four sides of this rhombus are marked to show they are congruent to each other. 
The marked angles of this isosceles triangle are congruent to each other. 
Congruent Triangles 
These triangles are congruent. Corresponding sides and angles are congruent. 
Congruent Plane Figures 
These figures are congruent because their shapes and sizes are identical, even though there are no sides or angles to measure and compare. 
Congruent Pyramids 
These are congruent figures because their sizes and shapes are identical. Note that corresponding faces of these pyramids are congruent. 
See
also
Similar, congruence
tests for triangles,
CPCTC, CPCFC
