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The small box at the vertex indicates that the vertex measures?

In: Math and Arithmetic, Algebra, Geometry [Edit categories]

Answer:

90 degrees

First answer by ID1101519903. Last edit by ID1101519903. Question popularity: 1 [recommend question].

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If the base of a isosceles triangle is 74 what is the measure of the vertex angle?
You can't calculate any angle if all you know is one side of the triangle.