In order for a triangle to exist, the two smaller sides must add to a number greater than the largest side.
So, 13+10 = 23
So, the number has to be smaller than 23, and the largest whole number less than 23 is 22. 
22 Is the largest possible whole number.
 
        
             
        
        
        
Both angles WILL have the same measure. 
So,
3x-10= x+40 (you have to set the equations equal to one another)
Now, add 10 to both sides. 
3x=x+50
Subtract x on both sides. 
2x=50
Divide both sides by 2. 
x=25
Now, plug in x. 
(25 +40)= 65
(3(25)-10)= 65
x equals 25 and both angles are equal to 65. Or "B".
I hope this helps!
~cupcake
        
             
        
        
        
I think the answer is 400 square centimetres
        
             
        
        
        
Answer:
17/6
So this is the answer. If you want to convert to decimal... The answer will be 2.83..hope it is right 
 
        
             
        
        
        
Three equivalent ratios are: 8/6, 12/9, 16/12