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4.phi.r^2 : 4.phi.R^2. (4.phi dicoret krn sama)
r^2. : (4r)^2
r^2. : 16r^2
1 : 16
24. akar 45 = akar (9.5)
= akar 9. akar 5
=3 . akar 5
= a^4.b