Radians circles

  • Thread starter synkk
  • Start date
  • #1
216
0
2lnwdp0.png


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.
 

Answers and Replies

  • #2
46
0


Hint: What is the relation between the angles DAB and DAC?
 
  • #3
216
0


Hint: What is the relation between the angles DAB and DAC?
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
46
0


That's right, and I believe your math is correct too.

Since all three sides of the triangles are congruent:
[itex]\overline{DB}\cong\overline{DC}[/itex] given
[itex]\overline{BA}\cong\overline{AC}[/itex] because they are the same length
[itex]\overline{AD}\cong\overline{AD}[/itex] trivial, they share a common line
Then the corresponding angles in the triangles must also be congruent.
 

Related Threads on Radians circles

Replies
7
Views
2K
  • Last Post
Replies
4
Views
10K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
3
Views
5K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
16
Views
2K
Top