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Final Answer:

The dance signature used when dancing cha-cha-cha is 4/4.

Explanation:

In dance, the time signature indicates the rhythm and timing of movements. The cha-cha-cha is typically danced to music with a 4/4 time signature, meaning there are four beats per measure, and each beat is a quarter note. This time signature provides a consistent rhythm for dancers to follow, with each step and movement aligning with the musical beats.

Furthermore, within the 4/4 time signature, the cha-cha-cha rhythm emphasizes a syncopated pattern, with the characteristic "cha-cha-cha" steps falling on the "2-and-3" counts of the measure. This syncopation adds flair and excitement to the dance, as dancers alternate between quick steps and slower movements, creating a dynamic and engaging performance.

Overall, the 4/4 time signature in cha-cha-cha allows for versatility in choreography while maintaining a structured rhythm for dancers to synchronize their movements with the music. This signature is essential for dancers to maintain the distinctive style and tempo of the cha-cha-cha dance, showcasing its lively and energetic nature.