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In the figure, $ABCD$ is a cyclic quadrilateral in which $AC$ and $BD$ are its diagonals. If $\angle DBC = 55^o$ and $\angle BAC = 45^o$, find $\angle BCD$.
"
Given:
$ABCD$ is a cyclic quadrilateral in which $AC$ and $BD$ are its diagonals.
$\angle DBC = 55^o$ and $\angle BAC = 45^o$.
To do:
We have to find $\angle BCD$.
Solution:
$\angle BAC$ and $\angle BDC$ are in the same segment.
This implies,
$\angle BAC = \angle BDC = 45^o$
In $\triangle BCD$,
$\angle DBC + \angle BDC + \angle BCD = 180^o$ (Sum of angles of a triangle)
$55^o + 45^o + \angle BCD = 180^o$
$100^o + \angle BCD = 180^o$
$\angle BCD = 180^o - 100^o = 80^o$
Hence $\angle BCD = 80^o$.
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