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: 👉 Subscribe for more math for fun videos 👉 🛍 Shop math t-shirt & hoodies: (10% off with the code “WELCOME10“) blackpenredpen