The perimeter of the quadrilateral is 37 cm. Which equation could be used to find the length of the missing side?
A.
x
+
12
=
37
−
11
B.
x
+
11
+
12
=
37
C.
x
+
21
÷
8
=
37
D.
x
+
31
=
37
B. x + 11 + 12 = 37
S
e
e
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n
o
y
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t
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c
a
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t
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x
t
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s
?