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Number Line Prime Class 6 Solutions Chapter 13 Understanding Elementary Shapes
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 13, Understanding Elementary Shapes. Here students can easily find step by step solutions of all the problems for Understanding Elementary Shapes, Exercise 13A, 13B, 13C and 13D 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 13 solutions. Here in this post all the solutions are based on latest Syllabus.
Understanding Elementary Shapes Exercise 13A Solution :
Question no – (1)
Solution :
(a) Not polygon
(b) Polygon
(c) Not polygon
(d) Polygon
(e) Not polygon
(f) Polygon
Question no – (2)
Solution :
(a) Pentagon (5 sides)
(b) Quadrilateral (4 sides)
(c) Triangle (3 sides)
(d) Quadrilateral (4 sides)
Question no – (3)
Solution :
(a) Vertices → P, Q, R, S, T, U
(b) Sides → PQ, QR, RS, ST, TU, UP
(c) Adjacent sides → (TS, SR), (SR, RQ), (RQ, QP), (QP, UP), (UT, UP), (UT, TS)
(d) Adjacent vertices → (P, Q), (Q, R), (R, S), (S, T), (T, U), (U, P)
(e) Diagonals → PS, QT, RU, TR, RP, PT, QU, SU, SQ
Question no – (4)
Solution :
Vertices → A, B, C, D, E, F, G
Question no – (5)
Solution :
Sum of angles
(a) Pentagon → 540°
(b) Quadrilateral → 360°
(c) Octagon → 1080°
Question no – (6)
Solution :
(a) The number of sides of a heptagon is Seven.
(b) An eight side polygon is called octagon .
(c) If all sides of a polygon are equal, it is called regular polygon.
(d) Hexagon is a polygon with six sides.
Understanding Elementary Shapes Exercise 13B Solution :
Question no – (1)
Solution :
(a) Scalene
(b) Isosceles
(c) Scalene
(d) Equilateral
Question no – (2)
Solution :
(a) Obtuseangled triangle. [90 <]
(b) Acuteangled triangle. [85 > 90]
(c) Rightangle triangle = 90°
(d) Acuteangle triangle [< 90°]
Question no – (3)
Solution :
(a) Scalene (Since 3 sides are different)
(b) Isosceles (Since 2 sides are equal)
Question no – (4)
Solution :
(a) Acuteangled triangle (No angle > 90)
(b) Obtuse angled triangle (One angle > 90)
Question no – (5)
Solution :
(a) Scalene – (Since 3 sides are different)
(b) Scalene – (Since 3 sides are different)
(c) Equilateral – (Since 3 sides are equal)
(d) Right angled triangle – (One angle is 90°)
(e) Acuteangle triangle – (No angle is > 90°)
Question no – (6)
Solution :
No.  Column (A)  No.  Column (B) 
(a)  Three sides of unequal length  (ii)  Scalene triangle 
(b)  One of the angles equal to 90°  (iii)  Right angle triangle 
(c)  One of the angle equal to 95°  (i)  Obtuse angled triangle 
(d)  Each angle equal to 60°  (v)  Equilateral triangle 
(e)  Two sides are equal  (iv)  Isosceles triangle 
Understanding Elementary Shapes Exercise 13C Solution :
Question no – (1)
Solution :
(a) The statement is – True.
(b) The statement is – False.
(c) The statement is – False.
(d) The statement is – False.
Question no – (2)
Solution :
(a) A quadrilateral whose sides are all equal > Rhombus
(b) A quadrilateral whose angles are all to 90° > Square
(c) A quadrilateral whose diagonal’s bisects each other > Square, rectangle, rhombus.
(d) A quadrilateral whose sides, angles and diagonals are all equal > Square.
Question no – (3)
Solution :
(a) Same size sides are also called a square.
(b) Parallelogram each angle is right angle called rectangle.
(c) If each angle of rhombus is 90° them it become square.
(d) As their sum of interior angles is 360°
(e) As their opposite sides are parallelogram.
Question no – (4)
Solution :
As the opposite angles of parallelogram are equal.
So, the opposite angle is 60°
Question no – (5)
Solution :
(a) E
(b) E
(c) E
Question no – (6)
Solution :
(a) All the sides of Square and Rhombus are equal in length.
(b) Trapezium is a quadrilateral with only one pair opposite sides parallel.
(c) A quadrilateral with two pairs of equal adjacent sides but unequal opposite sides is know as kite.
(d) Rhombus is a quadrilateral with all sides equal but with diagonals of equal length.
Understanding Elementary Shapes Exercise 13D Solution :
Question no – (1)
Solution :
(a) The given statement is – True.
(b) The given statement is – True.
(c) The given statement is – True.
(d) The given statement is – False.
Question no – (2)
Solution :
(a)  Centre of the circle  (iii)  O 
(b)  Radius of circle  (i)  OA 
(c)  Diameter of a circle  (ii)  AB

(d)  A chord  (v)  AD 
(e)  A sector  (iv)  EOB 
Question no – (3)
Solution :
O is Centre
AB is diameter
AO is radius
BOC is a sector
DXE is a segment
F is a point in its interior
Y is a point in its exterior.
Question no – (4)
Solution :
(a) Three radii > OA, OB, OP
(b) Two chords > AP, BP
(c) Diameter > AB
Question no – (5)
Solution :
(a) Chords of the circle > AB, PC
(b) All radii of the circle > OA, OB, OC, OD
(c) Chords but not diameter > PC
Chapter 13 Review Time Questions Solution :
Multiple choice Question :
Question no – (1)
Solution :
The sum of the angles of a triangle is 180°
Correct is option – (a)
Question no – (2)
Solution :
If the sum of the angles of a polygon is 540°, it is a Pentagon.
Correct is option – (b)
Question no – (3)
Solution :
Each angle of a regular pentagon is 108°
The correct is option – (b)
Question no – (4)
Solution :
Each angle of a rectangle is of 90°
Correct is option – (c)
Question no – (5)
Solution :
The sum of the angles of a quadrilateral is 360°
Correct is option – (b)
Question no – (6)
Solution :
The diagonal of a rhombus divides it into two Triangle
Correct is option – (c)
Question no – (7)
Solution :
If the diameter of a circle is 20 cm, its radius will be 20/2 = 10 cm
The correct is option – (b)
Question no – (8)
Solution :
A sevensided polygon is called a Heptagon.
The correct is option – (a)
Next Chapter Solution :
👉 Chapter 14 👈