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I am so confused. My teacher never mention these type of questions

I am so confused. My teacher never mention these type of questions-example-1
User Eveleen
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y= 40 and x= 20 cause a triangle is 180° and for the triangle with y 40+40+40=120 the the smaller triangle with x would have to be 60 but then u divide that into three to get the other three angles which would be 20
User Piyush Dhore
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