bantuin dong yaaa plisss tolong isi caranya jugao

1.a.L=22/7x rx r=22/7x 7x7=154cm^2
b. L=22/7x14x14=616cm^2
c. L=3.14x10x10=3.14x100=314cm^2
d. L=3.14x100x100=314x100=31.400cm^2
2.a.L=3.14x1/4xdxd=3.14x 1/4x20x20=3.14x100=314