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785 = 3,14 . r² . 10
785 = 31,4 r²
r² = 785 ÷ 31,4
r² = 25
r = √25
r = 5 cm
* luas alas = πr²
= 3,14 . 5 . 5
= 78,5 cm²
B. V = πr² . t
1848 = 22/7 . r² . 12
1848 . 7= 264 r²
12936 = 264 r²
r² = 12936 ÷ 264
r² = 49
r = √49
r = 7 m
C. * luas alas = πr²
158 = 3,14 . r²
158 = 3,14 r²
r² = 158 ÷ 3,14
r = √531
r = 7.9 cm
* V = πr² . t
3792 = 3,14 . 7,9 . 7,9 . t
3792 = 195,9674 t
t = 3792 ÷ 195,9674
t = 1,35015722 cm
D. V = πr² . t
= 22/7 . 14 . 14 . 32
= 22 . 2 . 14 . 32
= 19712 cm³