# What’s the value of x?

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Monzur R.
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Feb 7, 2018

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A slightly different way to do it.

Angles on a straight line add up to

But the angles of a triangle also add up to

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Jim G.
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Feb 7, 2018

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#"the exterior angle "120^@" is equal to the sum of the"#

#"opposite interior angles 2x and x"#

#rArr2x+x=120#

#rArr3x=120rArrx=40#

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