case 1<BR>In 2D coordinate system the sum of the angles of all quadrants=360 degree= 2pi radian<BR>in (x,y) plane<BR>Case 2<BR>In 3D coordinate system (x,y,z) I took 3 possible ...

CBSE Class 9 Maths extra questions and answers for Chapter 6 - Lines and Angles provided here for students to revise important fundamental concepts. Practicing with these questions will help you ...