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jari2 = 10 ; apotema =6 ; membentuk segitiga
jari2 lingkaran=sisi miring, apotema= tinggi, tali busur=2 * alas
alas"= miring" - tinggi" = 10" - 6" =100 - 36 = 64
alas= akar 64 = 8.
tali busur = 2 * alas = 2 * 8 = 16 cm