Lesson 4-2 Angles of Triangles. Ohio Content Standards:
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Transcript of Lesson 4-2 Angles of Triangles. Ohio Content Standards:
Ohio Content Standards:
Establish the validity of conjectures about geometric objects, their properties and relationships by counter-example, inductive and
deductive reasoning, and critiquing arguments made by others.
Ohio Content Standards:
Make and test conjectures about characteristics and properties (e.g.,
sides, angles, symmetry) of two-dimensional figures and three-
dimensional objects.
Theorem 4.2Third Angle Theorem
If two angles of one triangle are congruent to two angles of a
second triangle, then the third angles of the triangles are
congruent.
Theorem 4.3Exterior Angle Theorem
The measure of an exterior angle of a triangle is equal to the sum of
the measures of the two remote interior angles.