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78,5 = 22,5/360 x 3,14 x r²
78,5 = 5,0955 r²
r² = 78,5 / 5,0955
r = √400
r = 20 cm
Panjang busur = sudut pusat/360 x keliling lingkaran
= 22,5/360 x 2 x 3,14 x 20
= 7,85 cm
Keliling juring = 2 jari-jari + busur = 2x20 + 7,85 = 47,85 cm