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Class 9 NCERT Solutions- Chapter 11 Constructions – Exercise 11.2
  • Last Updated : 28 Dec, 2020

Question 1. Construct a ∆ ABC in which BC = 7 cm, ∠B = 75° and AB + AC = 13 cm.

Solution:

Steps of construction:

  1. Draw a line segment BC base of cm is drawn.
  2. At point B draw an angle of 75°.
  3. Cut BD =13cm from BY.
  4. Join ∠D which intersect BD at A.
  5. Join AC. Now triangle ABC is the required triangle

Question 2. Construct a ABC in which BC = 8 cm, ∠B = 45° and AB – AC = 35 cm.

Solution:

Steps of construction:



  1. Draw  a line segment BC=8cm.
  2. At point B, draw angle 45°.
  3. Cut BD=3.5 from BY.
  4. Join CD.
  5. Draw perpendicular bisector of CD, which construct BY at A.
  6. Join AC. NOW, ABC is the required triangle.

Question 3. Construct a ∆ ABC in which QR = 6 cm, ∠Q = 60° and PR – PQ = 2 cm.

Solution:

Steps of construction:

  1. Draw a line segment QR=6cm.
  2. At point Q draw angle 60°.
  3. Extend PQ to Y’.
  4. Cut QS =2cm from QY’.
  5. Join RS.
  6. Draw perpendicular bisector of RS which intersect QY at P.
  7. Join PR. Now, PQR is the required triangle.

Question 4. Construct a ∆ XYZ in which ∠Y = 30°, ∠Y = 90° and XY + YZ + ZX = 11 cm.

Solution:

Steps of construction:

  1. Draw a line segment AB=11cm.
  2. At point A draw ∠BAP=30°.
  3. At point B draw angle 90°.
  4. Draw the bisector of ∠BAP and ∠ABR which intersect each other at X.
  5. Join AX and BX.
  6. Draw perpendicular bisector of AX and BX which intersect AB on Y and Z respectively.
  7. Join XY and XZ. Then XYZ is the required triangle.

Question 5. Construct a right triangle whose base is 12 cm and sum of its hypotenuse and other side is 18 cm.

Solution:

Steps of construction:

  1. Draw a line segment of BC=12cm.
  2. At point B draw angle b=90°
  3. Cut BD =18cm.
  4. Join CD.
  5. Draw perpendicular bisector of CD which intersect BD at point A.
  6. Join AC. Now ABC is the required triangle.


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