1. Feb 16, 2012

### synkk

for part b i'm not sure how to do it

any hints on how to do it? Ive tried using sine rule etc but i'm just guessing, and i'm pretty sure there is a more simple method.

2. Feb 16, 2012

### Ninty64

Hint: What is the relation between the angles DAB and DAC?

3. Feb 16, 2012

### synkk

Right well I got this, i'm not sure if its right. DAB and DAC are equal so lets call DAB "a", 2pi = 2.2 + 2a so 2pi - 2.2 / 2 = a which is pi - 1.1 = 2.04?

4. Feb 16, 2012

### Ninty64

$\overline{DB}\cong\overline{DC}$ given
$\overline{BA}\cong\overline{AC}$ because they are the same length
$\overline{AD}\cong\overline{AD}$ trivial, they share a common line