Tolong dibantu ya:) Dan kasih jalannya ya..

A. r = 7 t = 15 volume? 1/3×πr²t
volume = 1/3×22/7×7×7×15
=154×5
= 770
B. r = 9 t = 10 volume? 1/3×πr²t
volume = 1/3×3,14×9×9×10
=3,14×270 = 847,8
C. t = 18 volume = 1884
volume = 1/3πr²t
1/3×π×r²×t = volume
1/3×22/7×r²×18 = 1884
396/21×r² = 1884
r² = 1884/396/21
= 1884×21/396
= 39564/396
=99,9090.... = 100 = √100 = 20
D. r = 7 volume = 924 t?
volume = 1/3πr²t
1/3πr²t = volume
1/3×22/7×7×7×t = 924
154/3×t = 924
t = 924/154/3
= 924×3/154
= 18cm