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r²=V÷πt
r²=20790÷(22/7×15)
r²=20790÷330/7
r²=20790 × 7/330
r=√441
r=21 cm
20790 = 22 x r² x 15
___
7
7 x 20790 = 22 x r² x 15
145530 = 330 x r²
r² = 145530
_______ = √441 = 21
330