Figures A, C and D are all examples of polygons!
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Answer is <span>a) line BC is congruent to line CD
this is not true
BC should be </span>congruent to line EC, not CD
Step-by-step explanation:
This figure has 1 line of symmetry
<h3>Key points :-</h3>
᪥ The formula to find the 31st term is : 
᪥ In the formula,
represents the first term of the sequence.
᪥
is the number of terms, In our case n is 31.
᪥
is the common difference between the terms, In our case d is 4.

<em>Detailed Solution is attached</em>᭄