m
∠
X
=
159
∘
\displaystyle {m}\angle{X}={159}^{\circ}
m
∠
X
=
159
∘
.
∠
X
\displaystyle \angle{X}
∠
X
and
∠
Y
\displaystyle \angle{Y}
∠
Y
are supplementary angles.
m
∠
Y
=
\displaystyle {m}\angle{Y}=
m
∠
Y
=
°
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