21st Century Skills: Self Direction – High School Geometry
Students discovered the four triangle congruence postulates and theorems (SSS, SAS, ASA, AAS) first hand. Students were divided into groups. Each group was given a ruler and 3 pairs of corresponding parts (sides and angles) in a bag. Pre-cut spaghetti noodles were used to represent the side lengths of triangles and angles were pre-cut from construction paper. The task of each group was to arrange the 3 pairs of corresponding parts differently and discover which combinations guarantee triangle congruence. They tried to construct as many pairs of congruent triangles as they could with parts they had.
21st Century Skill
Self Direction – The activity requires the student, in the process of discovery, to realize what properties they know about triangles. Consequently, students will have to decide how to use these properties to accomplish the task.
Teacher & Content Area
Pearl Hinlo, High School Geometry
Students prove basic theorems involving congruence. Belief in abilities; Goal-directed effort; Focusing attention. Help-seeking; Self-monitoring.
For more about 21st Century Learning: http://edtech.twinriversusd.org/21st-century-learning.html
Check out Grant High School – https://ghs-trusd-ca.schoolloop.com/
For more information about Twin Rivers USD – http://www.twinriversusd.org/