1.找规律1,4,9,16,,,49,.3,5,9,17,,,129,.2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是 ( ),面积是( ).

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1.找规律1,4,9,16,,,49,.3,5,9,17,,,129,.2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是(),面积是().1.找规律1,4,9,16,,,49,.3,5,9,

1.找规律1,4,9,16,,,49,.3,5,9,17,,,129,.2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是 ( ),面积是( ).
1.找规律
1,4,9,16,,,49,.
3,5,9,17,,,129,.
2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是 ( ),
面积是( ).

1.找规律1,4,9,16,,,49,.3,5,9,17,,,129,.2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是 ( ),面积是( ).
1,4,9,16,[25],[36],49,.
3,5,9,17,[33],65],129,.
2.用一根长10.28的绳子围成一个半圆,这个半圆的半径是 ( ),
面积是( ).
2r+3.14r=10.28
r=10.28/(2+3.14)=2米
s=3.14*2^2=12.56平方米