Ch 4 Notesheet Key
Ch 4 Notesheet Key
Ch 4 Notesheet Key
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<strong>Ch</strong> 4 Note Sheet L1 <strong>Key</strong><br />
Name ___________________________<br />
Do group Investigation 3, Exterior Angle of a Triangle on page 217 – 218 .<br />
Label the drawing with the following terms and define the terms:<br />
Exterior angle is an angle that forms a linear pair<br />
with one of the interior angles of a polygon.<br />
Adjacent interior angle is the angle of a polygon<br />
that forms a linear pair with a given exterior angle of<br />
a polygon.<br />
The remote interior angles (of a triangle) are the<br />
interior angles of a triangle that do not share a vertex<br />
with a given exterior angle.<br />
Triangle Exterior Angle Conjecture<br />
The measure of an exterior angle of a triangle is equal to the sum of the measures of the<br />
remote interior angles.<br />
Given ΔABC<br />
above. If a = 50 and b = 60, what<br />
is the measure of ∠ BCD ? Explain.<br />
50 + 60 = 110<br />
The exterior angle equals the sum of the<br />
two remote interior angles.<br />
Given ΔABC<br />
above. If x = 80 and b = 30, what<br />
is the measure of ∠ A ? Explain.<br />
80 – 30 = 50<br />
The exterior angle equals the sum of the<br />
two remote interior angles.<br />
Before starting Lesson 4.4:<br />
Vocab for triangles Triangles have 6 “parts”.<br />
∠A<br />
is opposite BC and AC is opposite ∠ B<br />
∠A<br />
is between BA and AC (angles are between sides)<br />
BC is between<br />
∠ B and ∠ C (sides are between angles)<br />
included angle is an angle formed between two consecutive<br />
sides of a polygon.<br />
B<br />
A<br />
C<br />
included side is a side of a polygon between two consecutive angles.<br />
S. Stirling Page 5 of 15
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