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setengah tali busur = 1/2 x 8 = 4
apotema =√(r² - (1/2 tali bsur)²
= √(5² - 4²)
= √(25 - 16)
= √9
= 3
apotema= akar dari 5kuadrat-4kuadrat
=akar dari 25 - 16
=akar dari 9
= 3