1.

What is the plane equation involved in the formula sin = ( frac {a1a+b1b+c1c}{ sqrt {a^2+b^2+c^2} sqrt{a1^2+b1^2+c1^2 }} )?

A. a<sub>1</sub>x b<sub>1</sub>y + c<sub>1</sub>z + d<sub>1</sub> = 0
B. a<sub>1</sub>x<sup>2</sup> + b<sub>1</sub>y<sup>2</sup> + c<sub>1</sub>z<sup>2</sup> + d<sub>1</sub> = 0
C. ax + by + cz+ d = 0
D. a<sub>1</sub>x + b<sub>1</sub>y + c<sub>1</sub>z + d<sub>1</sub> = 0 and ax + by + cz + d = 0
Answer» D. a<sub>1</sub>x + b<sub>1</sub>y + c<sub>1</sub>z + d<sub>1</sub> = 0 and ax + by + cz + d = 0


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