S = πR²
а)S=3,14×2²= 3.14×4=11.56 см²
б) S=3,14×5²=3,14×25=78,5 см²
в) R=D/2 R=4/2=2 S=3.14×2²=3.14×4= 11.56 см²
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S = πR²
а)S=3,14×2²= 3.14×4=11.56 см²
б) S=3,14×5²=3,14×25=78,5 см²
в) R=D/2 R=4/2=2 S=3.14×2²=3.14×4= 11.56 см²