1.

Let a_1x+b_1y+c_1z+d_1=0 and a_2x+b_2y+c_2z+d_2=0be two planes, where d_1, d_2gt0. Then, origin lies in acute angle, If a_1a_2+b_1b_2+c_1c_2lt0 and origin lies in obtuse angle if a_1a_2+b_1b_2+c_1c_2gt0. Further point (x_1, y_1, z_1) and origin both lie either in acute angle or in obtuse angle. If ( a_1x_1+b_1y_1+c_1z_1+d_1)(a_2x_1+b_2y_1+c_2z_1+d_2)gt0. one of (x_1, y_1, z_1) and origin in lie in acute and the other in obtuse angle,If ( a_1x_1+b_1y_1+c_1z_1+d_1)(a_2x_1+b_2y_1+c_2z_1+d_2)lt0 Q. Given the planes x+2y-3z+5=0 and 2x+y+3z+1=0. If a point P(2, -1, 2). Then

Answer»

O and P both LIE in acute angle between the planes
O and P both LIES in obtuse angle
O lies in acute angle, P lies in obtuse angle
O lies in obtuse angle, P lies in acute angle

Answer :(C)


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