Answer:
A) B and C
Step-by-step explanation:
To find the perimeter, add up the lengths of all the sides. 
For shape A: 16+16+1+1= 34
For shape B: 8+8+2+2= 20
For shape C: 5+5+5+5= 20
Shapes B and C both have a perimeter of 20. The answer is A, B and C. 
I hope this helps! 
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The other answer is not correct because they are finding the area of the rectangles. 
 
        
             
        
        
        

<u>Figure - 1</u> :
Let the missing side as " n "

Therefore the sides will be proportional,
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<u>Figure - 2</u> :
Let the missing side as " m "
The Triangles are similar, therefore their sides will be proportional.
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Answer:
<h3>D.) SAS or Side angle Side</h3>
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Are you asking for the letter or what the line is called because if it's just the letter then it is r if it is the name then its a plane intersect. 
 
        
                    
             
        
        
        
Answer:
 The pattern is that they are multiplying by -3 every time. 81*-3 = -243