Geometry - Ch. 5: Triangle (23 of TBD) Find Angle BCD=?

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Given an interesting “shape” and 2 angles in the “shape.” We will find angle BDC=?
Previous video in this series on KZbin: • Geometry - Ch. 5: Tria...
Or title seach on other platforms: Geometry - Ch. 5: Triangle (21 of TBD) Show Triangle PTS = Triangle RTQ
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Or title search on other platforms: Geometry - Ch. 5: Triangle (24 of TBD) Find x=? y=?

[@nielsheirbaut]

Why not just consider triangle BDC and since you know angle B and C do D = 180 - 30 - 45 = 105?

[@MichelvanBiezen]

There are often multiple ways to solve a problem.

[@Znxjsjnsdn]

Professor does the sidereal year have to do with the earth crossing the equator?

[@Znxjsjnsdn]

Professor how do you know the sidereal year accounts for precession and tropical doesn’t? What’s does that mean?

[@Znxjsjnsdn]

Professor what is precession of the equinoxes?

[@danlake7970]

Typo in video title asks about BCD but it's a given (30°) so I clicked to see what I missed.

[@simpleman283]

Yes, these are fun. lil brain teasers I call them.

[@MichelvanBiezen]

Learning is fun and good for your brain!