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geometry

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the transamerica pyramid building shown in the photograph has four faces shaped like isosceles triangles. The measure of a base angle of one of these triangles is about 85. What is the approximate measure of the vertex angle of the triangle?

  • geometry -

    call the base angle b, and the vertex angle v.

    b+b+v = 180
    170+v=180
    v = 10

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