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STANDARD G.CO.C.10

Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

WORKSHEETS Regents-Interior and Exterior Angles of Triangles 1a
GEO/GE/A
MC
1/11/5 TST
PDF
DOC
TNS
Regents-Interior and Exterior Angles of Triangles 1b
GEO/GE/A
bimodal
TST
PDF
DOC
Regents-Interior and Exterior Angles of Triangles 2
GE/A
4/2 TST
PDF
DOC
TNS
Regents-Midsegments
GEO/GE/A
1/16/1 TST
PDF
DOC
TNS
Regents-Triangle Proofs
GEO
4 TST
PDF
DOC
TNS
Practice-Interior and Exterior Angles of Triangles 1 10 WS
PDF
Practice-Interior and Exterior Angles of Triangles 2 6 WS
PDF
Journal-Interior and Exterior Angles of Triangles 5 WS
PDF
Practice-Midsegments 10 WS
PDF
Journal-Midsegments 2 WS
PDF
VIDEOS Applying the Triangle Angle-Sum Theorem VID
Using the Triangle Midsegment Theorem VID
Using the Triangle Midsegment Theorem to measure indirectly
 
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