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[latex]the\ sum\ of\ the\ neighboring\ angles\ of\ a\ parallelogram=180^0\\\\ (x+40^0)+(x-40^0)=180^0\\\\2x=180^0\ /:2\\\\x=90^0[/latex]
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[latex]the\ sum\ of\ the\ neighboring\ angles\ of\ a\ parallelogram=180^0\\\\ (x+40^0)+(x-40^0)=180^0\\\\2x=180^0\ /:2\\\\x=90^0[/latex]