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An isosceles triangle has base angles measuring 25 degrees each. What is the measure of the vertex angle?
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An isosceles triangle has base angles measuring 25 degrees each. What is the measure of the vertex angle?

User David Arango
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A triangle's sum must add to 180 degrees. If two of the angles, summed, equal 50 degrees, then the vertex angle must equal 130 degrees. So, the vertex angle equals 130 degrees.
User Phelhe
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