A semi circle is half a full circle. Find the area of the full circle and divide it by 2.
Area of a circle = pi x r ^2
R is half the diameter 
Area of full circle:
Area = 22/7 x 21^2
Area = 1386 sq. Ft
Area of stage = 1386/2 = 693 square feet
 
        
                    
             
        
        
        
D. , a prepositional phrase indicates relationships b/w subjects and verbs. The A-C answers are all just grammatical variations of actions. Also, if you want a quicker answer next time, try posting in the right section (this one would be English or Language). :)
        
             
        
        
        
Yay I guess I get points now. Lol
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
             
        
        
        
The answer to your question is 72 inches.