Answer :

Hrishii

Step-by-step explanation:

Length of arc

[tex] = \frac{ \theta}{360 \degree} \times c \\ \\ = \frac{72 \degree}{360 \degree} \times 20\\ \\ = \frac{1}{5} \times 20 \\ \\ = 4 \: units \\ [/tex]

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