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If m∠16=57°, and m∠20=39°, calculate m∠11

If m∠16=57°, and m∠20=39°, calculate m∠11-example-1
User Leek
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Check the picture below.

If m∠16=57°, and m∠20=39°, calculate m∠11-example-1
User Pavel Hodek
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