(1)周长:100×2+3.14×60,
=200+188.4,
=388.4(米),
100×60+3.14×(60÷2)2,
=6000+2826,
=8826(平方米);
(2)20×2+16+3.14×16÷2,
=40+16+25.12,
=81.12(米),
20×16-3.14×(16÷2)2÷2,
=320-100.48,
=219.52(平方米);
(3)20×2+16+3.14×16÷2,
=40+16+25.12,
=81.12(米),
20×16+3.14×(16÷2)2÷2,
=320+100.48,
=420.48(平方米).