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7850 = 3,14 r² 25
7850 = 78,5 r²
r²=7850/78,5
r²=100
r=10
t = 25 cm
V = 7.850 cm^3
r = ?
.......V = π.r^2. t
7.850 = 3,14. r^2. 25
7,850 = 78,5 . r^2
.....r^2 = 7850 / 78,5
.....r^2 = 100
.......r = √100
...........r = 10 cm
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