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I could really use your help , 25 POINTS!!

I could really use your help , 25 POINTS!!-example-1
User Astaar
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since line AB and CD make all right angles (given) angles 6+7+8 will equal 90 degrees.


According to the verticle angles rule:

angle 2 is equal to angle 6

angle 3 is equal to angle 7

angle 4 is equal to angle 8.


which proves that angle 2+4+7=90 degrees

User Pavel Perminov
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