Ответ:
1)С=2пr
r=C/2п
r=10×3,14/2×3,14=5 см.
S=r×c=5×31,4 cм^2=157 см^2
2) S=r×c
r=16п/2п=8п
S=5×16п=90п
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Ответ:
1)С=2пr
r=C/2п
r=10×3,14/2×3,14=5 см.
S=r×c=5×31,4 cм^2=157 см^2
2) S=r×c
r=16п/2п=8п
S=5×16п=90п