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785 = 3,14*r*r*10
= 31,4r^2
r^2 = 785/31,4
r^2 = 25
r = 5
LPT = Phi.r(r+t)
= 2*3,14*5(5+10)
= 31,4*15
= 471 cm persegi
Semoga jawabannya benar^