leiaelizb
leiaelizb
04-05-2018
Mathematics
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Can someone please help me with this
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lironica
lironica
04-05-2018
clearly its an isosceles triangle (two sides are equal)
then according to the theorem the third angle which is in front of 21 should be
and we know that sum of 3 angles in triangle is 180
x+x+38=180
2x=142
x=71
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