 
			 
			MCQOPTIONS
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				| 1. | If two vectors \(\vec{r}.\vec{n_1}=d_1\) and \(\vec{r}.\vec{n_2}=d_2\) are such that \(\vec{n_1}.\vec{n_2}\)=0, then which of the following is true? | 
| A. | The planes are perpendicular to each other | 
| B. | The planes are parallel to each other | 
| C. | Depends on the value of the vector | 
| D. | The planes are at an angle greater than 90° | 
| Answer» B. | |