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20. 60 (x + 20) Зх Sum of angle measures: 180°

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Dennis Huo · Answer 1 · 2021-06-25T02:45:04+0000

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Sum of the interior angles of any triangle equal 180° .

Thus ;

(x + 20) + 3x + 60 = 180

4x + 80 = 180

Subtract sides 80

4x + 80 - 80 = 180 - 80

4x = 100

Divide sides by 4

$(4)/(4) x = (100)/(4) \\$

x = 25

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