A dilation of figure A by a factor of 1/2 is the last figure with sides 1in, 2 in, 0.5 in and 2.5 inch. Since dilation means becoming larger, smaller or wider from one figure, this is also same with similar figures where the ratios of corresponding sides should be the same. In this problem, the ratio is 0.5 or 1/2. Therefore figure A is similar to the last figure.
Answer: Last option:
<span>With the compass point on the intersection of the perpendicular bisectors, put the pencil point on point R and draw a circle.</span>
A=2πrh+2πr2=2·π·6·25+2·π·6^2 so the answer is D
