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3 years ago

3 points

Mathematics

1 answer:

Anastaziya [24]3 years ago

6 0

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°.

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Answer:

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Answer:

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