If the vertex angle of an isosceles triangle is 80°, then the measure of an exterior angle to one of the base angles of this triangle is potions- (a) 100°. (b) 120° (c) 110° (d) 130°
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Step-by-step explanation:
(d) 130°
The exterior angle is always equal to sum of two opposite interior angles .
The other two angles will be (180-80)/2 each that is 50° each .
Now, vertex angle + base angle = 80° + 50° = 130°
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