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GEOMETRY 4.2: ANGLE
MEASURES OF A TRIANGLE
Objective: ________________________
__________________________________
• Triangle Sum Theorem: The sum of the measures of
the angles of a triangle is 180°.
_______ + _______+ ______= ________
1
2 3
Corollary to the Triangle Sum Theorem: The acute angles of a right triangle are complementary.
____ + _____ = ____
ANGLES OF A TRIANGLE
Interior angle: angle inside the triangle
Exterior angle: angle formed when one side of a triangle is extended
*Only one at each vertex
Exterior Angle Theorem: The measure of an exterior angle of a triangle equals the sum of the measures of the 2 remote interior angles.
_____ + _____ = ______
WARM-UP Grab a ruler from the clear bin on the
counter and partner up with one other person (groups of two)
TODAY Warm-up Objective: TLW define the Sum of angles
in a triangle theorem and apply it along with the corollary to problems
Activity-Sums of angles in a triangle Class practice problems
ACTIVITY Now on your own you and your partner
are to each cut out one more triangle Repeat the steps of the activity and see
if it holds true for triangles that you created on your own
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