# NCERT Class 12-Mathematics: Chapter – 11 Three Dimensional Geometry Part 11 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for NCO Class-11 is prepared by world's top subject experts: fully solved questions with step-by-step explanation- practice your way to success.

**Question 30**:

If the directions cosines of a line are , then

(A)

(B)

(C)

(D)

**Answer: (D)**

**Question 31**:

The distance of the plane from the origin is

(A)

(B)

(C)

(D) None of these

**Answer: (A)**

**Question 32**:

The sine of the angle between the straight line and the plane is

(A)

(B)

(C)

(D)

**Answer: (D)**

**Question 33**:

The reflection of the point in the plane is

(A)

(B)

(C)

(D)

**Answer: (D)**

**Question 34**:

The area of the quadrilateral ABCD, where and , is equal to

(A)

(B)

(C)

(D)

**Answer: (A)**

**Question 35**:

The locus represented by is

(A) A pair of perpendicular lines

(B) A pair of parallel lines

(C) A pair of parallel planes

(D) A pair of perpendicular planes

**Answer: (D)**

**Question 36**:

The plane makes an angle with axis. The value of is equal to

(A)

(B)

(C)

(D)

**Answer: (C)**

## Fill in the Blanks in Each of the Exercises 37 to 41

**Question 37**:

A plane passes through the points and . The equation of plane is ________.

**Answer**:

**Question 38**:

The direction cosines of the vector are ________

**Answer**: