help with circle

In circle H with m \angle GHJ= 90m∠GHJ=90 and GH=20 units, find the length of arc GJ.

Hello Guest!

$C=2\pi\cdot\overline{GH}\\\angle GHJ=90^\circ\\ \overline{GH}=20$

$(GJ)=\dfrac{2\pi \cdot \overline{GH}\cdot 90^\circ}{360^\circ}=\dfrac{2\pi \cdot 20\cdot 90^\circ}{360^\circ}=31.42$

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