Construct a Triangle from word problem with Circumcenter - WASSCE Past Question

This video is the solution to the 2017 WASSCE Nov/Dec GCE Exam featuring word problem on Bearing and Distance solved by construction.
Video highlights include the following:
1. How to construct angles 60 degrees, 45 degrees, 90 degrees, and 135 degrees.
2. How to bisect an angle
3. How to find the perpendicular bisector of a straight line
4. How to construct the circumcenter of a triangle
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[@textmenow7328]

I want to understand why the angle from D2 to D3 is 30. Cos the statement say 60.

[@DavetutsAcademy]

That angle isn't 30, but rather it's 60. You measure from the north when it comes to bearing. It seems you are looking at it from the horizontal but you should take it from the vertical (north). Recall that 30 from the horizontal and 60 from the vertical sum up to 90 which is a right angle