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AP Board Class 9 Maths Chapter 13 Geometrical Constructions Ex 13.1 Textbook Solutions PDF: Download Andhra Pradesh Board STD 9th Maths Chapter 13 Geometrical Constructions Ex 13.1 Book Answers

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Andhra Pradesh State Board Class 9th Maths Chapter 13 Geometrical Constructions Ex 13.1 Books Solutions

Board	AP Board
Materials	Textbook Solutions/Guide
Format	DOC/PDF
Class	9th
Subject	Maths
Chapters	Maths Chapter 13 Geometrical Constructions Ex 13.1
Provider	Hsslive

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AP Board Class 9th Maths Chapter 13 Geometrical Constructions Ex 13.1 Textbooks Solutions with Answer PDF Download

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AP State Syllabus 9th Class Maths Solutions 13th Lesson Geometrical Constructions Exercise 13.1

Question 1.
Construct the following angles at the initial point of a given ray and justify the construction.
a) 90°
Solution:

Let AB be the given ray.
Produce BA to D.
Taking A as centre draw a semi circle with some radius.
With X and Y as Center draw two intersecting arcs of same radius.

Let AB−→− be the given ray.
With A as centre draw an arc of any radius.
Mark off two equal arcs from X as shown in the figure with the same radius taken as before.
Bisect the second segment.
Join the point of intersection of above arcs, with A.
∠BAC is the required right angle.
Join the point of intersection ‘C’ and ‘A’.
∠BAC = 90°

In ΔAXY; ∠YAX = 60° and
in ΔAYC ∠YAC = 30° ∠BAC = 90°

b) 45°
Solution:
Steps:

Construct 90° with the given ray AB.
Bisect it from ∠BAD = 45°

Steps:

Construct ∠BAC = 60°
Bisect ∠BAC = ∠DAC = 30°
Bisect ∠DAC such that ∠DAE = ∠FAC = 15°
∠BAE=45°

ΔAXZ is equilateral
and ∠YAZ = 15°
∴∠XAY = 45°

Question 2.
Construct the following angles using ruler and compass and verify by measuring them by a protractor.
a) 30°
Solution:

Construct ∠ABY = 60°
Bisect ∠ABY = 60°
Such that ∠ABC = ∠CBY = 30°

b) 2212∘
Solution:

Construct ∠ABD = 90°.
Bisect ∠ABD such that ∠ABC = ∠CBD = 45°
Bisect ∠ABC such that
∠ABE = ∠EBC = 2212∘

c) 15°
Solution:

Steps of construction : ,

Construct ∠BAE = 60°
Bisect ∠BAE such that ∠BAC = ∠CAE = 30°
Bisect ∠BAC such that ∠BAF = ∠FAC = 15°

d) 75°
Solution:

Steps of construction :

Construct ∠BAC = 60°
Construct ∠CAD = 60°
Bisect ∠CAD such that ∠BAE = 90°
Bisect ∠CAE such that ∠BAF = 75°

e) 105°
Solution:

Steps of construction:

Construct ∠ABC = 90°
Construct ∠CBE = 30°
Bisect ∠CBE such that the angle formed ∠ABD = 105°

f) 135°
Solution:

Steps of construction:

Construct ∠ABC = 120°
Construct ∠CBD = 30°
Bisect ∠CBD such that the angle formed ∠ABE = 135°

Question 3.
Construct an equilateral triangle, given its side of length of 4.5 cm and justify the constraction.
Solution:
A.

Draw a line segment AB = 4.5 cm.
With B and A as centres draw two arcs of radius 4.5 cm meeting at C.
Join C to A and B.
ΔABC is the required triangle.

Justification:
In ΔABC
AB = ∠C ⇒ ∠C = ∠B
Also AB = BC ⇒ ∠C = ∠A
Hence ∠A = ∠B = ∠C
But ∠A + ∠B + ∠C = 180°
∴ ∠A = ∠B = ∠C = 180∘3 = 60°

Question 4.
Construct an isosceles triangle, given its base and base angle and justify the construction. [Hint: You can take any measure of side and angle]
Solution:
A.

Steps:

Draw a line segment AB of any given length.
Construct ∠BAX and ∠ABY at A and B such that ∠A = ∠B.
AX−→− and BY−→− will intersect at C.
ΔABC is the required triangle.

Justification:
Drop a perpendicular CM to AB from C.
Now in ΔAMC and ΔBMC
∠AMC = ∠BMC [Right angle]
∠A = ∠B [Construction]
CM = CM (Common)
∴ ΔAMC ≅ ΔBMC
⇒ AC = BC [CPCT]

AP Board Textbook Solutions PDF for Class 9th Telugu

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