Two equilateral triangles are merged together to form a rhombus. Find the perimeter of the rhombus formed if the length of a side of the equilateral triangle is 3 cm.

12 cm

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15 cm

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3 cm

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9 cm

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Solution

The correct option is A
12 cm

Perimeter is the measure of the distance of the boundary of a planar object. It is also defined as the total sum of lengths of all the bounding sides of a planar object.
$∴$ The perimeter of the given rhombus
= AB + BC + CD + DA
= 3 + 3 + 3 + 3
= 12 cm

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