The area of any triangle is            (1/2) x (length of the base) x (height) .
In this problem, we know the triangle's height, 
but what is the length of the base ?
The base is the side that the triangle is sitting on.  This particular triangle 
is an equilateral one, and its perimeter is 60m.  So each side must be 20m.  
No matter which side the triangle is sitting on, the length of the base is 20m.
           Area = (1/2) x (base) x (height)
           Area = (1/2) x (20m) x (17.3m) =  <em>173 m²</em>
        
                    
             
        
        
        
The answer is a because<span>
12 times 2 plus 16 times 2 is 56. 
144 + 256 = 400
400 = Xx2 
X = 20 feet. 
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Answer:
(2*5) 3*7-1*6÷3*2+1*4÷2*5=216
 
        
                    
             
        
        
        
Answer: A.) 21/5 but as a mixed number it's 4 1/5 B.) 175/24 but as a mixed number it's 7 7/24
Step-by-step explanation: