Philip P. answered • 12/03/21

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The double curved lines mean they have the SAME VALUE. And, if you see a "stairstep," it means a right angle (90 degrees). The sum of the three angles of any triangle is 180 degrees, and since P+Q+R = 180 and P=Q, that means that 40+40+R=180. Easy to find R now.
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12/03/21

Julie B.

Not really I dont understand it12/03/21