NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex 6.2

NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex 6.2 are part of NCERT Solutions for Class 10 Maths. Here are we have given Chapter 6 Triangles Class 10 NCERT Solutions Ex 6.2. 

• Triangles Class 10 Ex 6.1
• Triangles Class 10 Ex 6.3
• Triangles Class 10 Ex 6.4
• Triangles Class 10 Ex 6.5
• Triangles Class 10 Ex 6.6

NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex 6.2

NCERT Solutions for Class 10 Maths

Page No: 128

Question 1. (i) and (ii), DE || BC. Find EC in (i) and AD in (ii).

Solution:

(i)



Let EC = x

Since DE || BC.

Therefore, by basic proportionality theorem,

(ii)



Let AD = x

Since DE || BC,

Therefore by basic proportionality theorem,

Question 2. E and F are points on the sides PQ and PR respectively of a ΔPQR.

For each of the following cases, state whether EF || QR.

(i) PE = 3.9 cm, EQ = 3 cm, PF = 3.6 cm and FR = 2.4 cm

(ii) PE = 4 cm, QE = 4.5 cm, PF = 8 cm and RF = 9 cm

(iii) PQ = 1.28 cm, PR = 2.56 cm, PE = 0.18 cm and PF = 0.63 cm

Solution:

(i)



Given that PE = 3.9, EQ = 3, PF = 3.6, FR = 2.4

Now,



(ii)



PE = 4, QE = 4.5, PF = 8, RF = 9



(iii)



PQ = 1.28, PR = 2.56, PE = 0.18, PF = 0.36

Question 3. In the fig 6.18, if LM || CB and LN || CD, prove that

Solution:



In the given figure

Since LM || CB,

Therefore by basic proportionality theorem,

Question 4. In figure , DE || AC and DF || AE. Prove that 

Solution:



In ∆ABC,

Since DE || AC

Question 5. In figure , DE || OQ and DF || OR, show that EF || QR.

Solution:



In ∆POQ

Since DE || OQ

Question 6. In the figure, A, B and C are points on OP, OQ and OR respectively such that AB || PQ and AC || PR. Show that BC || QR.

Solution:

Question 7. Using Basic proportionality theorem, prove that a line drawn through the mid-points of one side of a triangle parallel to another side bisects the third side. (Recall that you have proved it in Class IX).

Solution:



Consider the given figure

PQ is a line segment drawn through midpoint P of line AB such that PQ||BC

i.e. AP = PB

Now, by basic proportionality theorem



i.e. AQ = QC

Or, Q is midpoint of AC.

Question 8. Using Converse of basic proportionality theorem, prove that the line joining the mid-points of any two sides of a triangle is parallel to the third side. (Recall that you have done it in Class IX).

Solution:



Consider the given figure

PQ is a line segment joining midpoints P and Q of line AB and AC respectively.

i.e. AP = PB and AQ = QC

Now, we may observe that



And hence basic proportionality theorem is verified

So, PQ||BC

Question 9. ABCD is a trapezium in which AB || DC and its diagonals intersect each other at the point O.

Show that (frac { AO }{ BO } =frac { CO }{ DO } )

Solution:

Question 10. The diagonals of a quadrilateral ABCD intersect each other at the point O such that (frac { AO }{ BO } =frac { CO }{ DO } ). Show that ABCD is a trapezium.

Solution:

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