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jarak dari pusat k tali busur (apotema) = misalkan apotema = x, tali busur = y
maka, x^2 = r^2 - (1/2y)^2
x^2 = 5^2 - 4^2
x^2 = 25 - 16
x^2 = 9
x = 3
(di gambar lebih mudah)