this special triangle gives us sin(18º)

We will compute the exact value of sin(18 degrees), i.e. sin(pi/10), with this 18-72-90 special right triangle. We will also see the golden ratio during the computation when we use the quadratic formula! This is a classic geometry and trigonometry problem. If you like math, then you will enjoy it! sin(18 degrees) with the quadratic formula: 👉    • Finding the exact value of sin(18 degrees)   💪 Support this channel and get my math notes by becoming a patron:   / blackpenredpen   🛍 Shop my math t-shirts & hoodies: 👉 https://amzn.to/3qBeuw6 👉 Support this channel and get more content   / blackpenredpen