Notes: Lesson 3-2: Exterior Angle Theorem, Study notes of Geometry

Exterior Angles of a Triangle. The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.

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Name____________________________#________
__ Date_____________________Period____________
Notes: Lesson 3-2: Exterior Angle Theorem
Exterior Angles of a Triangle
The measure of an exterior
angle of a triangle is equal to
the sum of the measures of its
two remote interior angles.
interior + interior = exterior
Example 1.)
Find x.
Example 2.)
Find x.
Example 3.)
Find x.
HW:
x°
58°
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Name____________________________#________ __ Date_____________________Period____________

Notes: Lesson 3 - 2: Exterior Angle Theorem

Exterior Angles of a Triangle The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.

interior + interior = exterior

Example 1.) Find x.

Example 2.) Find x.

Example 3.) Find x.

HW:

Example 4.) Refer to the figure below. Find the value of x.

Example 5.) Find the in the figure below.

Example 6.) Find the missing angles in the figure below.

Example 7.) Find the missing angles in the figure below.

5x + 7 = ______ 5 + 3x = ______

𝑚 𝐷𝐸𝐶 = _______