3. 14×2÷0.5,

=6.28÷0.5,

= 12.56,

≈ 12(Ba)；

A: This round table can seat 12 chairs.

Firstly, the circumference of the round table is calculated by using the circumference formula of the circle, because each chair needs an arc length of 0.5 meters. Divide the circumference of the round table by 0.5, the chair can be put down, and the corresponding solution can be obtained.

This topic mainly investigates the application of the calculation method of pi in real life.

Satisfied and looking forward to being adopted