Circumference of the circle touching the lines 3x+4y-3=0,6x+8y-1=0 is
(A) `pi (B) (pi)/(3) (C) 6 pi (D) (pi)/(2)`

Radius of the circle touching the lines 3x+4y-14=0,6x+8y+7=0 is

The angle between the planes 2x-y+z=6 and x+y+2z=7 is (A) pi/4 (B) pi/6 (C) pi/3 (D) pi/2

Area lying in the first quadrant and bounded by the circle x^2+y^2=4 and the lines x=" "0" "a n dx=" "2 is (A) pi (B) pi/2 (C) pi/3 (D) pi/4

Smaller area enclosed by the circle x^2+y^2=4 and the line x" "+" "y" "=" "2 is (A) 2(pi""-2) (B) pi-2 (C) 2pi-1 (D) 2(pi+2)

The inclination of the tangent to the curve y^(2)=4x drawn at the point (-1 2) is (A) (pi)/(3) (B) (pi)/(6) (C) (pi)/(4) (D) (pi)/(2)

The inclination of the tangent to the curve y^(2)=4x drawn at the point (-1 2) is (A) (pi)/(3) (B) (pi)/(6) (C) (pi)/(4) (D) (pi)/(2)

The angle between the plane 2x-y+z=6 nand x+y+2z=3 is (A) pi/3 (B) cos^-1 1/6 (C) pi/4 (D) pi/6

The angle between the two tangents from the origin to the circle (x-7)^(2)+(y+1)^(2)=25 equals (A) (pi)/(4) (B) (pi)/(3) (C) (pi)/(2) (D) (pi)/(6)

The angle between the plane 2x-y+z=6 and a plane perpendicular to the planes x+y+2z=7 and x-y=3 is: (A) (pi)/(4) (B) (pi)/(3)( C )(pi)/(6)( D )(pi)/(2)

Find the radius of a circle which touches two lines 3x-4y-6=0 and 6x-8y+1=0.