Understand Congruence It is often difficult for students to The following activity provides a hands on method for having in Terms of Rigid identify the correct combination students investigate what combination of corresponding sides and Motions/G.CO.7 and of corresponding sides and angles will create two congruent triangles. G.CO.8 angles required to establish that Activity two triangles are congruent. Materials Needed Straws each pair of students will need: two 3 inch straws; – two 4 inch straws and two 5 inch straws Angle templates- each pair of students should receive 6 index cards with angles drawn on them in the following manor: two right angles, two 36.8 degree angles and two 53.2 degree angles. Have students use the angles and straws to determine the fewest number of parts needed to construct identical triangles. Discuss how those parts need to be organized SSS, SAS, ASA, etc. –
Understand Congruence in Terms of Rigid Motions/G.CO.7 and G.CO.8 It is often difficult for students to identify the correct combination of corresponding sides and angles required to establish that two triangles are congruent. The following activity provides a hands on method for having students investigate what combination of corresponding sides and angles will create two congruent triangles. Activity Materials Needed Straws – each pair of students will need: two 3 inch straws; two 4 inch straws and two 5 inch straws Angle templates- each pair of students should receive 6 index cards with angles drawn on them in the following manor: two right angles, two 36.8 degree angles and two 53.2 degree angles. Have students use the angles and straws to determine the fewest number of parts needed to construct identical triangles. Discuss how those parts need to be organized – SSS, SAS, ASA, etc.
Geometry_Unit_Plan_for_Unit_1_Congruence_Proofs_and_Constructions_Jan_4.docx