## RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.2

These Solutions are part of RD Sharma Class 10 Solutions. Here we have given RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.2

**Other Exercises**

- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.1
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.2
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.3
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.4
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.5
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.6
- RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.7
- RD Sharma Class 10 Solutions Chapter 7 Triangles Revision Exercise
- RD Sharma Class 10 Solutions Chapter 7 Triangles VSAQS
- RD Sharma Class 10 Solutions Chapter 7 Triangles MCQS

**Question 1.**

In a ∆ABC, D and E are points on the sides AB and AC respectively such that DE || BC.

(i) If AD = 6 cm, DB = 9 cm and AE = 8 cm, find AC. **(C.B.S.E. 1995)**

(ii) If = and AC = 15 cm, find AE. **(C.B.S.E. 1994)**

(iii) If = and AC = 18 cm, find AE. **(C.B.S.E. 1994C)**

(iv) If AD = 4, AE = 8, DB = x – 4, and EC = 3x – 19, find x. **(C.B.S.E. 1992C)**

(v) If AD = 8 cm, AB = 12 cm and AE = 12 cm, find CE. **(C.B.S.E. 1992C)**

(vi) If AD = 4 cm, DB = 4.5 cm and AE = 8 cm, find AC.** (C.B.S.E. 1992C)**

(vii) If AD = 1 cm, AB = 6 cm and AC = 9 cm, findAE. **(C.B.S.E. 1992C)**

(viii) If = and EC = 2.5 cm, find AE.

(ix) If AD = x, DB = x – 2, AE = x + 2 and EC = x – 1, find the value of x. **(C.B.S.E. 1993C)**

(x) If AD = 8x – 7, DB = 5x – 3, AE = 4x – 3 and EC = (3x – 1), find the value of x.

(xi) If AD = 4x – 3, AE = 8x – 7, BD = 3x – 1 and CE = 5x – 3, find the value of x.** (C.B.S.E. 2002)**

(xii) If AD = 2.5 cm, BD = 3.0 cm and AE = 3.75 cm, find the length of AC. **(C.B.S.E. 2006C)**

**Solution:**

**Question 2.**

In a ∆ABC, D and E are points on the sides AB and AC respectively. For each of the following cases show that DE || BC:

(i) AB = 12 cm, AD = 8 cm, AE = 12 cm and AC = 18 cm. **(C.B.S.E. 1991)**

(ii) AB = 5.6 cm, AD = 1.4 cm, AC = 7.2 cm and AE = 1.8 cm.** (C.B.S.E. 1990)**

(ii) AB = 10.8 cm, BD = 4.5 cm, AC = 4.8 cm and AE = 2.8 cm.

(iv) AD = 5.7 cm, BD = 9.5 cm, AE = 3.3 cm and EC = 5.5 cm.

**Solution:**

In ∆ABC, D and E are points on the sides AB and AC respectively

(i) AB = 12 cm, AD = 8 cm, AE = 12 cm and AC = 18 cm

DB = AB – AD = 12 – 8 = 4 cm and EC = AC – AE = 18 – 12 = 6 cm

**Question 3.**

In a ∆ABC, P and Q are points on sides AB and AC respectively, such that PQ || BC. If AP = 2.4 cm, AQ = 2 cm, QC = 3 cm and BC = 6 cm, find AB and PQ.

**Solution:**

In ∆ABC,

P and Q are points on AB and AC respectively such that PQ || BC

AP = 2.4 cm, AQ = 2 cm, QC = 3 cm and BC = 6 cm

**Question 4.**

In a ∆ABC, D and E are points on AB and AC respectively such that DE || BC. If AD = 2.4 cm, AE = 3.2 cm, DE = 2 cm and BC = 5 cm, find BD and CE.** (C.B.S.E. 2001C)**

**Solution:**

In the ∆ABC, DE || BC

AD = 2.4 cm, AE = 3.2 cm, DE = 2 cm and BC = 5 cm

**Question 5.**

In the figure, state if PQ || EF.

**Solution:**

In ∆DEF

PQ intersects DE and DF at P and Q respectively

Such that DP = 3.9 cm, PE = 3 cm DQ = 3.6 cm, QF = 2.4 cm

**Question 6.**

M and N are points on the sides PQ and PR respectively of a ∆PQR. For each of the following cases, state whether MN || QR.

(i) PM = 4 cm, QM = 4.5 cm, PN = 4 cm, NR = 4.5 cm

(ii) PQ = 1.28 cm, PR = 2.56 cm, PM = 0.16 cm, PN = 0.32 cm

**Solution:**

(i) In the ∆PQR

M and N are points on PQ and PR respectively

PM = 4 cm, QM = 4.5 cm, PN = 4 cm, RN = 4.5 cm

**Question 7.**

In three line segments OA, OB, and OC, points L, M, N respectively are so chosen that LM || AB and MN || BC but neither of L, M, N nor of A, B, C are collinear. Show that LN || AC.

**Solution:**

Given : On OA, OB and OC, points are L, M, and N respectively

Such that LM || AB, MN || BC

**Question 8.**

If D and E are points on sides AB and AC respectively of a ∆ABC such that DE || BC and BD = CE. Prove that ∆ABC is isosceles. **(C.B.S.E. 2007)**

**Solution:**

Given : In ∆ABC, D and E are points on the sides AB and AC such that BD = CD

Hope given RD Sharma Class 10 Solutions Chapter 7 Triangles Ex 7.2 are helpful to complete your math homework.

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