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 ________.
Answer:
coordinates
Question 44:
A line is parallel to axis if all the points on the line have equal ________.
Answer:
Question 45:
represent a plane parallel to ________.
Answer:
plane
Question 46:
The plane parallel to plane is perpendicular to ________.
Answer:
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 ______.
Answer:
Question 48:
If the distance between the points and is , then a _______.
Answer:
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 ________.
Answer:
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 |
Answer:
(a) ↔ (iii)
(b) ↔ (i)
(c) ↔ (ii)
(d) ↔ (vi)
(e) ↔ (iv)
(f) ↔ (v)
(g) ↔ (viii)
(h) ↔ (vii)
(i) ↔ (x)
(j) ↔ (ix)