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314 = 3,14 x r²
314 : 3,14 = r²
100 = r²
√100 = r
10 = r
panjang busur = α/360 x π x 2 x r
busur = 45/360 x 3,14 x 2 x 10
busur = 0,125 x 3,14 x 20
busur = 0,125 x 62,8
busur = 7,85 cm
Panjang busur = 45/360 x 3,14 x 2 x 10 = 7,85 cm