Angle Sums and the 15-75-90 Right Triangle
- Steve Phelps
The Angle Sum Rectangle
Study the rectangle below and be certain you understand where each of the trigonometric expressions comes from. How would the expression change if AF=1? How would the expression change if EF=1?
15-75-90 Special Right Triangle
Apply your side-chasing skills and the angle sum rectangle above to find the exact lengths of the missing triangle side lengths below. Based on this, devise a 15-75-90 Special Right Triangle rule.