С=2πr=18,84 => r=C/2π=18,84/2*3,14=9,42/3,14 = 3см
S=πr²=3,14*3²=9*3,14 = 28,26см²
S=28,26см²
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С=2πr=18,84 => r=C/2π=18,84/2*3,14=9,42/3,14 = 3см
S=πr²=3,14*3²=9*3,14 = 28,26см²
S=28,26см²