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= 785 / 3,14×10
= 25
r = 5
Lp = πr(r+2t)
= 3,14×5(5+2×10)
= 3,14×5(5+20)
= 3,14×5×25
= 392,5
785= 3,14.r(pangkat dua).10
785=3,14.r(pangkat dua)
r(pangkat dua)=785÷3,14
r(pangkat dua) =25
r= (akar dari 25=5)
luas permukaan=2.phi.r.(r+t)
=2.3,14.5.(5+10)
=157.15
=2355 cm
maaf kalo salah