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What is the measure of the blue angle?

 

 Jan 11, 2020
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The slope of the black line   that  rises from left to  right  = 1/2

 

The slope of the  line that rises from right to left  = 2/-1 =  -2/1

 

Since these lines have negative reciprocal slopes, they are  perpendicular

 

So....the angle    =  90°

 

 

cool cool cool

 Jan 11, 2020

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