If the perimeter of triangle ABC is 45, which is the perimeter of triangle CRB?

56
54
45
44

Question

If the perimeter of triangle ABC is 45, which is the perimeter of triangle CRB?

56 
   54 
   45 
   44

anonymous · Answer

We need more information than that.

geometry_hater · Answer

here

anonymous · Answer

Figure out the length of $\overline{CB}$ based on the given sides and given perimeter of $\triangle ABC$.  Then you'll be able to just add all of the sides of $\triangle CRB$ to find its perimeter.

geometry_hater · Answer

how do i figure BC theres no hints to help me figure it out

anonymous · Answer

You know the perimeter of $\triangle ABC$ and you know the length of two of the sides.  It's just a matter of subtracting those two side lengths from the perimeter to find the extra side length.

geometry_hater · Answer

its 20

ok so thats BC now what?

anonymous · Answer

You know all of the sides of $\triangle CRB$ now, so you can find the perimeter.

geometry_hater · Answer

ahh so its 54

geometry_hater · Answer

thanks

anonymous · Answer

Correct.