2R=13
R=6,5 cm
z pitagorasa:
r²+6²=6,5²
r²=6,25
r=√6,25=2,5 cm
Pole pierscienia P= πR²-πr²= π(6,5²-2,5²)=36π
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2R=13
R=6,5 cm
z pitagorasa:
r²+6²=6,5²
r²=6,25
r=√6,25=2,5 cm
Pole pierscienia P= πR²-πr²= π(6,5²-2,5²)=36π