Δtic is an isosceles triangle with vertex angle i. find the measures of the base angles of δtic if m∠i = 100º.
a)80°
b)50°
c)60°
d)40°

It would be D: 40 degrees. This is because in an isosceles triangle, the base angles are the same and since the measure of a triangle equals 180 degrees, the base angles would be 40 degrees because 100+40+40 = 180.

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