A teacher gives the formula to find the area of a rectangle and asked the children to find the area of different rectangular cut-outs. The teacher is using

Correct option is B

The deductive method involves teaching a general rule or principle and then applying it to specific examples. In this case, the teacher is teaching the formula for the area of a rectangle (length × width) and then asking the students to apply this formula to find the area of different rectangular cut-outs. This is an example of the deductive method of teaching.
The inductive method involves observing specific examples and then drawing a general rule or principle. The observation method involves making observations about the world around us. The laboratory method involves conducting experiments to test hypotheses.