Question 761745
In an isosceles triangle, the 2 base angles are equal, and the third is the vertex angle.

Also, sum of the 3 angles is 180 deg.

If the base angle is x, the other base angle is also x

{{{x + x + 30 = 180}}}

{{{2x = 150}}}

{{{highlight(x = 75)}}}

{{{highlight(Measure of base angle = 75 degrees)}}}

:)