Originally Posted by

**zymeth02**
Hi, KBTA, i see that u used the angle and area relationship to solve question 1. I have a question though.

Let's say angle E is the the third angle of the triangle with angles C and D.

The equation should be E/360 = area of circular region covered by E / area of circle, right?

The area of the circular region covered by E includes the small unshaded triangle, and a small shaded region. However, in your equation, you seem to have ignored the area of the shaded part, and only considered the area of the small triangle (20pi*1/2). Could you explain why?