What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 54°? 108° 126° 72° 63°

An isosceles triangle has same  base angles

 if one of the base angles measure 54 degrees, 2nd is  also 54

And a triangle measures up to 180 degrees.

180 = x + 2(54)

180 = x + 108

x = 72

72 is right option

hope this helps

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i think its a.

hope this

sorry i really don't know what tiles and steps you are referring to

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