The Unit Rate is the start of the slope/the y-intercept of the slope.To find that we need to make the slope first. 
(shown in the first picture)
       We can see that the slope is a linear function/a straight line, and if we just follow the line down the slope we can see that it has a y-intercept/unit rate of 2/3 of 1 whole. 
(the second picture)
 
        
             
        
        
        
Answer:
The answer to your question is Triangle's area = 520 in², Square's area = 576 in²
Step-by-step explanation:
Process
1.- Calculate the area of the triangle
-Find the length of the base using the Pythagorean theorem
           c² = a² + b²
-Solve for b²
           b² = c² - a²
-Substitution
           b² = 37² - 35²
-Simplification
           b² = 1369 - 1225
           b² = 144
           b = 12 in
-Find the base
           base = 2(12) = 24 in
-Find the area of the triangle
          Area = base x height / 2
-Substitution
          Area = 24 x 35 / 2
-Simplification
          Area = 420 in²
2.- Find the area of the square 
Area = side x side 
-Substitution
Area = 24 x 24
-Result
Area = 576 in²
     
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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234 millimeters^2 is your answer