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07 Grade, Unit 7
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Section A Checkpoint
Section A
Section A Checkpoint
Problem 1
Write an equation to represent the relationship between 2 or more angles in this diagram.
Find the values of
a
a
a
,
b
b
b
, and
c
c
c
.
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Solution
Sample responses:
a
+
27
=
90
a+27=90
a
+
27
=
90
b
+
c
=
180
b+c=180
b
+
c
=
180
a
+
b
+
c
+
27
=
360
−
90
a+b+c+27=360-90
a
+
b
+
c
+
27
=
360
−
90
a
=
63
a=63
a
=
63
b
=
27
b=27
b
=
27
c
=
153
c=153
c
=
153