# NCERT Class 11-Math's: Chapter –12 Introduction to Three Dimensional Geometry Part 12

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Question 43:

A line is parallel to plane if all the points on the line have equal ________.

coordinates

Question 44:

A line is parallel to axis if all the points on the line have equal ________.

Question 45:

represent a plane parallel to ________.

plane

Question 46:

The plane parallel to plane is perpendicular to ________.

axis

Question 47:

The length of the longest piece of a string that can be stretched straight in a rectangular room whose dimensions are 10, 13 and 8 units are ______.

Question 48:

If the distance between the points and is , then a _______.

or

Question 49:

If the mid-points of the sides of a triangle AB; BC; CA are ,

and , then the centriod of the triangle ABC is ________.

Question 50:

Match each item given under the column to its correct answer given under column .

 Column Column (a) In - plane (i) Its octant (b) Point lies in the (ii) Plane (c) Locus of the points having x coordinate 0 is (iii) z-coordinate is zero (d) A line is parallel to x-axis if and only (iv) z-axis (e) If taken together will represent the (v) Plane parallel to xy-plane (f) represent the plane (vi) If all the points on the line have equal y and z-coordinates. (g) Planes represent the line (vii) From the point on the respective (h) Coordinates of a point are the distances from the origin to the feet of perpendiculars (viii) Parallel to z - axis. (i) A ball is the solid region in the space enclosed by a (ix) Disc (j) Region in the plane enclosed by a circle is known as a (x) Sphere

(a) ↔ (iii)

(b) ↔ (i)

(c) ↔ (ii)

(d) ↔ (vi)

(e) ↔ (iv)

(f) ↔ (v)

(g) ↔ (viii)

(h) ↔ (vii)

(i) ↔ (x)

(j) ↔ (ix)

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