Analysis: According to the meaning of the question, this chicken farm is a trapezoid, with a base of 12 m, an upper base of (40-23- 12=5) m and a height of 23 m, which can be solved by substituting into the area formula of the trapezoid.

Answer:

Solution: 40- 12-23=5 (m),

(5+ 12)×23÷2,

= 17×23÷2,

= 195.5 (m2);

Answer: The chicken farm covers an area of 195.5 square meters.

Comments: This topic mainly investigates the application of trapezoidal area calculation method in real life.

Extended data:

Similar questions:

(1) Fence a trapezoidal chicken farm (as shown in the picture). Using the wall of the house, the total length of the fence is 65 meters, and the area of the chicken farm is sought.

Answer: The side with the wall can be omitted.

So: (65- 15)x 15÷2

=50x 15÷2

=375(㎡)

The area of chicken farm is 375 square meters.

Reason: Because one party has already used the wall of the house. So that the wall can be omitted. In this way, it is only necessary to calculate the upper and lower bottoms of the trapezoid. Then its height is already known as 15cm. In this way, as long as15m is subtracted from15m, it is equal to the sum of the upper bottom and the lower bottom.