Sectors cut from a yellow circle are pasted on an equilateral triangle as shown. If the area covered by the yellow region is $77 c m^{2}$ , the perimeter of the triangle (in cm) is:

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Solution

The correct option is C 42

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If the area of an equilateral triangle is $25 \sqrt{3} c m^{2}$ , then its perimeter = ____ cm.

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