Educating Our Eagles - Issue 19
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HIGH SCHOOL:<br />
Triangle Congruence<br />
This ninth grade lesson involves the determination of triangle congruence. Students<br />
are required to evaluate the congruence based not only on measurements but also<br />
on rigid mapping of one figure onto the other. This mapping is a series of rigid<br />
transformations. This rigid transformation helps students grasp the concepts of congruence.<br />
Congruence is defined by this concept of rigid mapping.<br />
As a result of instruction students will be able to:<br />
• determine whether or not two figures are congruent.<br />
Observations:<br />
Students liked the process of moving figures by the rules of transformations. They could<br />
literally watch the figures mapping themselves onto one another.<br />
MA Standards:<br />
Geometry, Congruence, B.8. Explain how the criteria for triangle congruence (ASA, SAS,<br />
& SSS) follow the definition of congruence in terms of rigid motions.<br />
EDUCATING OUR EAGLES<br />
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