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What is the value of r

User Soutot
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Finding an unkown angle

Since 69º alongside r form a straight line, then they form together a 180º angle. This means that:

69º + r = 180º

We need to find a number that added to 69º is 180º. This number is

180º - 69º = 111º

Since

69º + 111º = 180º

then

r = 11º

Answer: r = 111º

User Peter Badida
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