Multiply both sides by x so that x will be in the numerator
        
                    
             
        
        
        
The summation of the angle measures of a polygon is given by:
180(n - 2).
Thus, we need to find: 1800 = 180(n - 2)
10 = n - 2
n = 12
Therefore, the shape is a dodecagon, and the number of sides it has is 12.
        
             
        
        
        
Answer:
No. Remember, a right angle must have a 90 degree angle. We can find the lengths with the Pythagorean Theorem.
Step-by-step explanation:
Given the length 7, 10, and 12, we can assume that 12 is the hypotenuse (it is the longest length). 
- we can use 7 and 10 interchangeably. 
Fill in the equation, 
                  where c = 12, and a or b = 7 or 10. 
To indicate if the given lengths would form a right angle, we can only input 7 or 10, not both. 
Therefore,  or
 or 
 ==> 49 + b^2 = 144 ==> <u>b= </u>
 ==> 49 + b^2 = 144 ==> <u>b= </u> <u> ==> </u><u>9.746</u>
<u> ==> </u><u>9.746</u>
b= 9.7, not 10.
 ==> 100 + b^2 = 144 ==> <u>b = </u>
 ==> 100 + b^2 = 144 ==> <u>b = </u> <u> ==> </u><u>6.633 </u>
<u> ==> </u><u>6.633 </u>
b= 6.6, not 7. 
Therefore, the lengths 7, 10, and 12, does NOT make a right triangle. 
Hope this helps!
 
        
             
        
        
        
When you add all the numbers up and then divide by two you get the answer
        
             
        
        
        
Five is b
Six is a
Seven is a 
Goood day now