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## 3 points The measure of the vertex angle of an isosceles triangle is 120 degrees. What is the measure of the base angle? O 30 de

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## Answers ( )

Answer:a) The measure of the base angle is 30°.Step-by-step explanation:The angle formed by the vertex of two equal sides in an isosceles triangle is called a

VERTEX ANGLE.Also, the other two base angles are equals they are opposite to equal sides.

Now, let us assume that the base angle = a

So, by

ANGLE SUM PROPERTY:Sum of all angles of triangle = 180°

⇒

120° + a + a = 180°or, 2 a = 180 -120 = 60°

or, a = 60/2 = 30°

or,

a = 30°Hence, the measure of the base angle is 30°.