12)diameter=k/π
=157/3,14
=50 cm
L=πr²
=3,14 . 25 . 25
=1962,5 cm²
13)L=45/360 .πr²
=45/360 . 22/7 . 14 . 14
=45/360 . 616
=77 dm²
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12)diameter=k/π
=157/3,14
=50 cm
L=πr²
=3,14 . 25 . 25
=1962,5 cm²
13)L=45/360 .πr²
=45/360 . 22/7 . 14 . 14
=45/360 . 616
=77 dm²