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Geometry
Section 4.1
Section 4.1: Apply Triangle Sum Properties
EQ:
Geometry
Section 4.1
Geometry
Section 4.1
Investigation 1:
Draw a triangle (use straightedge)
Cut out the triangle
Label inside each angle: A, B, C
Tear off each angle
Arrange tear-offs adjacently
Make an observation
Theorem4.1:TriangleSumTheorem
Thesumofthemeasuresoftheinterioranglesofatriangleis_______.
(Theacuteanglesofarighttriangleare___________________________.)
Geometry
Section 4.1
Investigation 2:
Draw a triangle with a "tail"
Measure outside obtuse angle formed by "tail"
Measure inside angles not adjacent outside angle
Fill in a row on whiteboard with measures
Make an observation
Theorem4.2:ExteriorTheorem
Themeasureofanexteriorangleofatriangleisequaltothesumof
ofthe
angles.
Geometry
Section 4.1
Sec 4.1 Summary:
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