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r = 21 cm
besar sudut pusat = 72
ditanya panjang busur ?
maka :
Panjang busur AB = 72/360 x 2πr
= 0,2 x 2 x 22/7 x 21
= 26,4 cm
besar sdudt/a = 72 derajat
panjang busur AB = ...?
rumus
pb ab =
pb. ab =