The reaction force is the force that counterbalances the weight of the roof and acts upwards.
What is reaction force?
The question is incomplete but I will try to help you the much I can. The image of the house is not shown hence the free body diagram can not be produced.
However, let me explain to you that force is a vector hence it has direction. The total resultant force is obtained by taking the direction of all the forces into account and this is called resolution of the forces. The reaction force is the force that counterbalances the weight of the roof and acts upwards.
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