I am a P.E. teacher and haven't done any trig in a decade... I am trying to find the internal angles of the frame of my bike to get a custom bag made for the frame. I have the measurements of the internal length of each tube, and I also have some kind of angle measurement the tube is sitting at, but not sure how to read it correctly, or use a cosine formula to find out the angles of each point. Again, it needs to be the INTERNAL angles.
(TT) Top Tube length: 19 1/8 inch OR 48.57 cm
(ST) Seat Tube length: 16 1/4 inch OR 41.275 cm
(DT) Down Tube length: 23 inches OR 58.42
Lastly, there is a gap in the triangle due to the steer tube and the size of the bike, so 2 points of the triangle are not exactly touching: 1 inch OR 2.54cm
Below is a picture of the bike, the labled tubes, and the lengths of each tube.
This is also the geometry of the bikes that has the ST angle but its on the wrong side... It is measured from the rear triangle not the main frame triangle. (SIZE 52)
I have tried using an online triangle calculator thing, and this was the output...
Side B is the Seat Tube (ST) Side A is the Top Tube (TT) and Side C is the Down Tube (DT). The unit of the numbers is in centimeters.
Let me know if I can provide any other information that would be helpful in solving this.
- 398 views
- Gear - Wing Spar Linkage
- Mechanical principle science (maths)
- Spherical Trig question
- Find $\int \sec^2 x \tan x dx$
- Trigonometry sin cot CAST
- Find the volume of a 3D region bounded by two surfaces
- Find the area bounded by the graphs of two functions
- Help Calculating Surface Area of a Cylinder with a Slit