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dit : OF?
*OB = 1/2 BD = 1/2.10(akar)2 = 5(akar)2
#pake teorema pythagoras
*OF = [akar] OB(kuadrat)+BF(kuadrat)
= [akar] 25.2 + 100
= [akar] 50+100
= [akar] 150
= 5(akar)6