4.3. Congruent Triangles http://www.ck12.org
Concept Problem Revisited
There are 16 “A” triangles and they are all congruent. There are 16 “B” triangles and they are all congruent. The
quilt pattern is made from dividing up the square into smaller squares. The “A” triangles are all 321 of the overall
square and the “B” triangles are each 1281 of the large square. Both the “A” and “B” triangles are right triangles.
Vocabulary
Two figures arecongruentif they have exactly the same size and shape. Two triangles arecongruentif their three
pairs of corresponding angles and three pairs of corresponding sides are congruent.
Guided Practice
- Determine if the triangles are congruent using the definition of congruent triangles.
- Determine if the triangles are congruent using the definition of congruent triangles.
- Determine if the triangles are congruent using the definition of congruent triangles.