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r=20cm
α:360×2πr=180:360×2π×20=20π
20π=2πr/:2π
r=10cm
l=20cm
h=√20²-10²=√400-100=√300=10√3cm
v=⅓πr²h=⅓π×10²×10√3=3 333 ⅓√3πcm³