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360' = x
X = (360x78,5)/22,5
X = 1256 (luas lingkaran)
L Lingkaran = 3,14 x r x r
1256 = 3,14 x r x r
400 = r x r
Jari jari = 20cm
Keliling lingkaran = 3,14 x 2 x 20 = 125,6
Panjang busur juring =
22,5' = x
360' = 125,6
X = (22,5 x 125,6) / 360
X = 7,85
Keliling juring = 20 + 7,85 + 20 = 47,85