The pairs of rectangles are similar polygons; Option C and Option D.
<h3>What is a polygon?</h3>
A polygon is a closed figure made up of three or more line segments connected end to end.
Similar polygon beings their sides have equivalent ratios to each other.
Two polygons whose corresponding angles are congruent and the lengths of the corresponding sides are proportional.
C. 1.89/2.1 = 81/0.9 = 90
D. 120 / 24 = 60 / 12 = 5
Hence, Option C and Option D are similar polygons only.
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