Answer :

Answer:

Step-by-step explanation:

Important things to know:

The sum of the angles in any triangle is equal to 180º

An isosceles triangle has two angles that are equal in measurement, while the third one is not

Answer:

40 degrees.

Step-by-step explanation:

As it has 2 equal sides it is an isosceles triangle and it also has 2 equal angles. The other angle cannot be 100 degrees because that is greater than 180 degrees, so the two equal angles must sum to 180 - 100 = 80 degrees.

Each angle measures 40 degrees.

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