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STANDARD G.CO.C.10
GEO

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
3/11/6 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-Exterior Angle Theorem 1
GEO/GE
1/14 TST
PDF
DOC
TNS
Regents-Exterior Angle Theorem 2
A
9 TST
PDF
DOC
TNS
Regents-Triangle Inequality Theorem
GE/A/B
8/10/1 TST
PDF
DOC
TNS
Regents-Angle Side Relationship
GE/A
17/1 TST
PDF
DOC
TNS
Regents-Midsegments
GEO/GE
2/16 TST
PDF
DOC
TNS
Regents-Triangle Proofs
GEO/GE
4/1 TST
PDF
DOC
TNS
Regents-Medians, Altitudes and Bisectors
GE/B
3/1 TST
PDF
DOC
TNS
Regents-Centroid, Orthocenter, Incenter and Circumcenter
GE
24 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
Practice-Exterior Angle Theorem 6 WS
PDF
Practice-Triangle Inequality Theorem 10 WS
PDF
Practice-Angle Side Relationship 6 WS
PDF
Practice-Midsegments 10 WS
PDF
Practice-Triangle Proofs 2 WS
PDF
Practice-Centroid, Orthocenter, Incenter and Circumcenter 3 WS
PDF
Journal-Interior and Exterior Angles of Triangles 5 WS
PDF
Journal-Midsegments 2 WS
PDF
VIDEOS Applying the Triangle Angle-Sum Theorem VID
Applying the Triangle Exterior Angle Theorem
Using the Triangle Midsegment Theorem VID
Using the Triangle Midsegment Theorem to measure indirectly
Applying properties of isosceles triangles VID
Using inequalities involving sides of triangles VID
Using inequalities involving angles of triangles
Finding the lengths of medians VID
Using concurrent lines
 
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