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How does an adjacent angle look.
Assuming the configuration is as follows. With the triangle inside the square D B A E C Angle CBD = 90 & Angle ABC = 60, therefore angle ABD = 30 (90-60) We also know that angle DBE = 45 (half square) So DBE-ABD=ABE which is 45 - 30 = 15 Its a bit confusing without proper diagrams but it works.
It is: 180-vertex angle = exterior angle
The vertex of the angle.