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**Number Line Prime Class 6 Solutions Chapter 12 Basic Geometrical Ideas**

Welcome to NCTB Solutions. Here with this post we are going to help 6th class students for the Solutions of Number Line Prime Class 6 Math Book, Chapter 12, Basic Geometrical Ideas. Here students can easily find step by step solutions of all the problems for Basic Geometrical Ideas, Exercise 12A, 12B and 12C Also here our mathematics teacher’s are solved all the problems with easily understandable methods with proper guidance so that all the students can understand easily. Here in this post students will get chapter 12 solutions. Here in this post all the solutions are based on latest Syllabus.

**Basic Geometrical Ideas Exercise 12A Solution :**

**Question no – (1)**

**Solution :**

**(a)** Edge of a table is line.

**(b)** A sheet of paper is plane.

**(c)** Surface of a floor is plane.

**(d)** Corners of a square is line.

**Question no – (2) **

**Solution :**

**(a)** AC (line)

**(b)** (Pays) → OA, OB, OC, OD, OE

**(c)** Points → O, A, B, C, D, E

**(d)** Live segments → OA, OB, OC, OD, OE

**Question no – (3)**

**Solution :**

Possible lines are,

AB, AC, AD, AE, BC, BD, BE, CD, CE, DE

**Question no – (4) **

**Solution :**

**(a)** The statement is True

**(b)** The statement is False (No points on AD line)

**(c)** The statement is False (They are not)

**(d)** The statement is True

**(e)** The statement is True (They exist opposite side)

**(f)** The statement is True (B is the intersection point)

**Question no – (5)**

**Solution :**

**(a)** Planes → ABCD, DAEH, CGFB, DCGH, HEFG, ABFE

**(b)** Points → A, B, C, D, E, F, G, H

**(c)** Parallel to AEHD → CGFB

**(d)** Inter section line of EFGH and CDHG → HG

**Question no – (6)**

**Solution :**

**(a)** Open

**(b)** Close

**(c)** Open

**(d)** Open

**(e)** Close

**Basic Geometrical Ideas Exercise 12B Solution :**

**Question no – (1) **

**Solution :**

**(a)** AF < AE

**(b)** BC = EF

**(c)** ED < BD

**(d)** FC > AB

**(e)** AE = BD

**(f)** FG < GH

**(g)** AB = ED

**Question no – (2) **

**Solution :**

In ascending order

**(c)** EF

**(d)** GH

**(a)** AB

**(b)** CD

**Basic Geometrical Ideas Exercise 12C Solution :**

**Question no – (1) **

**Solution :**

**(a)** ∠ABC < ∠XYZ

**(b)** ∠ABC > ∠XYZ

**(c)** ∠ABC < ∠XYZ

**Question no – (2) **

**Solution :**

**(a)** Reflex angle

**(b)** Straight angle

**(c)** Right angle

**(d)** Acute angle

**(e)** Obtuse angle

**(f)** Obtuse angle

**Question no – (3)**

**Solution :**

Acute angle : ∠1, ∠3, ∠5, ∠7

Obtuse angle : ∠2, ∠4, ∠6, ∠8

**Question no –** **(4)**

**Solution :**

**(a)** 72° = acute angle

**(b)** 100° = abtuse angle

**(c)** 90° = Right angle

**(d)** 35° = acute angle

**(e)** 180° = straight angle

**(f)** 205° = reflex angle

**Question no – (5) **

**Solution :**

**(a)** 3 o’clock → Right angle

**(b)** 6 o’clock → straight angle

**(c)** 1 o’clock → acute angle

**(d)** 11 o’clock → acute angle

**Question no – (6) **

**Solution :**

**(a)** Two right angle

= 90° + 90°

= 180°

**(b)** Four right angle

= 90° + 90° + 90° + 90°

= 360°

**(c)** One and a half right angle

= 90 + 90/2

= 90° + 45°

= 135°

**(d)** 5/9 right angle

= 5/9 × 90°

= 5 × 10

= 50°

**Next Chapter Solution : **

👉 Chapter 13 👈