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panjang apotema = V(r^2 - (1/2 tali busur)^2 )
misalkan soal : berapa panjang apotema lingkaran jika diketahui panjang jari" lingkaran 10 cm dan panjang tali busur lingkaran 12 cm?
panjang apotema = V(10^2 - (1/2.12)^2
= V(10^2 - 6^2)
= V64
= 8 cm