Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 Re: Help Me ! » Triangle Proofs » 2017-05-09 08:53:30
I need help in trying to find cos(36). How will splitting the 36-36-108 help?
#2 Help Me ! » Help on this proof!! » 2017-03-13 08:14:58
- Geomtry.202
- Replies: 2
Let the incircle of triangle ABC be tangent to sides BC, AC, and AB at D, E, and F, respectively. Prove that triangle DEF is acute. I haven't learned any trig yet. One of the hints were : Compute the angles of triangle DEF in terms of the angles of triangle ABC.
[I added the img tags so that the picture will show -bobbym]
Pages: 1