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Remember that regular polygon has equal sides and equal interior angles so ,
in the figure, the length of the side of the two smaller equal Triangles is equal to the length of the sides of the regular pentagon
there fore
the triangle in white of the figure is an isosceles triangle
the measure of the vertex angle of the isosceles triangle is equal to
360-(108+60+60)=132
Remember that
the sum of the interior angles of the must be equal to 180 degrees
so
2b+132=180
slove for b
2b=180-132
2b=48
b=24(here all values are in degrees )