M 2 = 2x°, m 3 = 5x°, m 1 = 2x + 5x 5x - 2x 180 - 5x 180 - 7x

asked Nov 14, 2019 196k views

4 votes

M 2 = 2x°, m 3 = 5x°, m 1 =

2x + 5x
5x - 2x
180 - 5x
180 - 7x

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We know: the sum of measures of triangle angles is 180°.

Therefore we have the equation

$m\angle1+m\angle2+m\angle3=180^o\to m\angle1=180^o-m\angle2-m\angle3$

Substitute
$m\angle2=2x,\ m\angle3=5x$ :

$m\angle1=180-2x-5x=180-7x$

Mazin Luriahk answered Nov 18, 2019

8.9k points

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