The sine of 30° is  0.5 .
Angles don't have y-values, and neither do their sines.  But
IF you draw a graph of the sine function, AND the angles 
(the independent variable) are marked off on the x-axis of 
the graph, AND the value of the sine function of each angle 
(the dependent variable) is marked off on the y-axis of the 
graph, THEN the y-value corresponding to the angle of 30° 
would be displayed as 0.5 . 
        
             
        
        
        
SA=4pir^2
SA=4pi13^2
SA=4pi169
SA=676pi ft^2
        
                    
             
        
        
        
Based on the definition of <em>composite</em> figure, the area of the <em>composite</em> figure ABC formed by a semicircle and <em>right</em> triangle is approximately 32.137 square centimeters. 
<h3>How to find the area of the composite figure</h3>
The area of the <em>composite</em> figure is the sum of two areas, the area of a semicircle and the area of a <em>right</em> triangle. The formula for the area of the composite figure is described below:
A = (1/2) · AB · BC + (π/8) · BC²     (1) 
If we know that AB = 6 cm and BC = 6 cm, then the area of the composite figure is:
A = (1/2) · (6 cm)² + (π/8) · (6 cm)²
A ≈ 32.137 cm²
Based on the definition of <em>composite</em> figure, the area of the <em>composite</em> figure ABC formed by a semicircle and <em>right</em> triangle is approximately 32.137 square centimeters. 
To learn more on composite figures: brainly.com/question/1284145
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I believe the answer is 311.157055138. That is if i did my math correctly. I hope this helps. Good luck!
        
                    
             
        
        
        
X=7.5 area= 42 
You know that the total perimeter is 39 so to find x you need to add what you already have. You’ll find there are 3 sides you don’t know the length of and all you have to do is find the shorter one which is basically 9-7=2 then add everything together and subtract it from 39 then divide it by 2 to find the two sides left