2. Find the value of the unknown interior angle \small x in the following figures:

        

Answers (1)

As we know that the exterior angle is equal to the sum of the opposite internal angles. So, 

i) 60^0+x=120^0\Rightarrow x=120^0-60^0=60^0

ii) 70^0+x=100^0\Rightarrow x=100^0-70^0=30^0

iii) x+90^0=125^0\Rightarrow x=125^0-90^0=35^0

iv) x+60^0=120^0\Rightarrow x=120^0-60^0=60^0

v) x+30^0=80^0\Rightarrow x=80^0-30^0=50^0

vi) x+35^0=75^0\Rightarrow 75^0-35^0=40^0

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