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PLEASE HELP with #20! I know the drawing part; how do I "estimate the measure of one angle"???

PLEASE HELP with #20! I know the drawing part; how do I "estimate the measure-example-1

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I would guess that angle 1 would be about 45 degrees, making angle 5 45 as well. This is because the whole thing is 180, and half is 90, so half of 90 is 45
User Arunagw
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