Find the angle in the triangle?

[CrazCo]

http://cemc.uwaterloo.ca/Contests/past_contests/2001/2001FermatContest.pdf

 

Number 16. I honestly have no clue

[mooeypoo]

You need to review triangle properties for this question. Specifically:

 

• What is the sum of all the angles in a triangle?
  
• What does it mean if a triangle has 2 equal vertices?
  
• What does it mean if a triangle has a 90 degree angle?
  

Those questions are very easy once you go over the properties of triangles.

 

Here's a few resources:

 

http://mathworld.wolfram.com/Triangle.html

http://www.mathwarehouse.com/geometry/triangles/

http://euclid.barry.edu/~mat476/Apang/apangppt2/sld003.htm

 

Good luck!