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OpenStudy (cwrw238):
angle 1 = 3m + 20 (opposite angles of parallelogram are equal)
also
5m + 3m + 20 = 180o
8m + 20 = 180
8m = 160
m = 20
now plug m = 20 into formula for angle 1
OpenStudy (anonymous):
all the angles added up equal 360 right?
OpenStudy (cwrw238):
yes - also the two angles on each 'side' add up to 180
OpenStudy (anonymous):
it will be 80
OpenStudy (anonymous):
because the acute angle on the other side is 80
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