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Geometry 4-1 & 4-2

October 28, 2009

4-1 (Classifying Triangles)
Presentation: 8-tab foldable

Angle Measure Side Length
Acute Triangle Equlateral Triangle
Equiangular Triangle Isosceles Triangle
Right Triangle Scalene Triangle
Obtuse Triangle Triangle Sum Theorem

4-2 (Angle Relationships)
Presentation: Envelope fold (4-tab) foldable

Exterior Angle Theorem The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles. (w/ diagram)
Corollary 4-2-2 The acute angles of a right angle are complementary. (w/ diagram)
Corollary 4-2-3 The measure of each angle of an equiangular triangle is 60°. (w/ diagram)
Third Angles Theorem If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles is congruent. (w/ diagram)
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