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**Exercise 12.1**

**1. A point is on the ****axis. What are its ****coordinates and ****coordinates?**

**Ans. **We know that coordinates of any point on the axis will be Therefore, coordinate and coordinate of the point are zero.

**2. A point is on XZ-plane. What can you say about its ****coordinate?**

**Ans. **We know that coordinates of any point in XZ-plane will be Therefore coordinate of the point is zero.

**3. Name the octants in which the following points lie:**

** **

**Ans. **Point (1, 2, 3) lies in I octant.

Point lines in IV octant.

Point lines in VIII octant.

Point lines in V octant.

Point lines in VIII octant.

Point lines in VIII octant.

**4. Fill in the blanks:**

**(i) The ****axis and ****axis taken together determine a plane known as ____________.**

**(ii) The coordinates of points in the XY-plane are of the form ____________.**

**(iii) Coordinates planes divide the space into ____________ octants.**

**Ans. (i)** XY-plane

**(ii)**

**(iii)** Eight

Very nice