Perimeter for any figure is the sum of all sides.
So the perimeter of hexagon = 30 cm.
So each side of hexagon = 30 / 6
= 5 cm
When two hexagons are joined, each side of each hexagon overlaps.
So total number of sides of the new figure is 10.
So the new perimeter = 10 × 5
= 50 cm
So the correct answer is D [50 cm].
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