



 
Hi Arthi, I can be very specific without seeing the actual problem but I can give you an idea. The normal way to determine the angle between two planes is to construct a normal to each plane and then calculate the angle between the normals. This is equal to the angle between the planes. If you can work with vectors and $u$ and $v$ are normal vectors to the planes then \[u \cdot v = u \times v \times \cos(\theta)\] where $\theta$ is the measure of the angles between the vectors. Hence if you know $u$ and $v$ you can use the inverse cosine function to find $\theta.$ I hope this is of some help,  


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