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2.
3.tali busur
4.panjang busur
5. tembereng
6. k= 2 × π × r
66 = 2 ×22/7 × r
66= 44/7 r
66 × 7/44 = r
10.5 = r
maka diameter = 2 × r = 2 × 10.5 = 21