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The opposite angles of a parallelogram a...

The opposite angles of a parallelogram are equal.

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Let `ABCD` be the given parallelogram.
So, `AD` parallel `BC` and `AB` parallel `DC`.
Let `/_A=x`
Then `/_D=180^@-/_A= 180^@- x` (Because `/_A` and `/_D` are interior opposite angles)
`/_C=180^@-/_D=x`
`∠B=180^@-/_A=180^@-x`
Thus, we can see that the opposite angles `angleA` and `angleC` are equal; and the opposite angles `angleB` and `angleD` are also equal.
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