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In a parallelogram ABCD , prove that sum...

In a parallelogram `ABCD` , prove that sum of any two consecutive angles is `180^@`

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"In a parallelogram `A B C D`
opposite angles `/_A=/_C`and
`/_B=/_D`
from angle sum `/_A+/_B+/_C+/_D=360^@`
`/_A+/_B+/_A+/_B=360^@`
`(/_A+/_B)=180^@`
similarly `(/_C+/_D)=180^@`
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