Remember my skill testing question on Day 23?
It’s easy to figure out. You remember SOHCAHTOA from school right?
Use Sin() = Opposite over Hypotenuse:
Sin(120-45) = opposite/25
Opposite = Sin(75) x 25 = 24.1
However, we need the length of the adjacent side of the triangle, therefore the pythagorean theorem comes in handy:
Hypotenuse(squared) = opposite(squared) + adjacent(squared)
25(squared)= 24.1(squared) + adjacent(squared)
Adjacent = square root of 44 = approximately 6.6kms/hour
According to my calculations, I was facing a relative headwind of only 6.6kms/hour. No wonder why biking was so easy that day (at least until the storm hit)!
If I calculated this all wrong, please let me know, but it sounds about right anyway.