NCERT Solutions for Class 7 Maths Chapter 6 The Triangle and its Properties Ex 6.5

NCERT Solutions for Class 7 Maths Chapter 6 The Triangle and its Properties Ex 6.5

• Class 7 Maths The Triangle and Its Properties Exercise 6.1
• Class 7 Maths The Triangle and Its Properties Exercise 6.2
• Class 7 Maths The Triangle and Its Properties Exercise 6.3
• Class 7 Maths The Triangle and Its Properties Exercise 6.4
• Class 7 Maths The Triangle and Its Properties Exercise 6.5

NCERT Solutions for Class 7 Maths Chapter 6 The Triangle and its Properties Exercise 6.5
Ex 6.5 Class 7 Maths Question 1.
PQR is a triangle, right angled at P. If PQ = 10 cm and PR = 24 cm, find QR.

Solution:
In right angled triangle PQR, we have
QR ² = PQ ² + PR ² From Pythagoras property)
= (10) ² + (24) ²
= 100 + 576 = 676
∴ QR = \(\sqrt{676}\) = 26 cm
The, the required length of QR = 26 cm.

Ex 6.5 Class 7 Maths Question 2.
ABC is a triangle, right angled at C. If AB = 25 cm and AC = 7 cm, find BC.

Solution:
In right angled∆ABC, we have
BC ² + (7) ² = (25) ² (By Pythagoras property)
⇒ BC ² + 49 = 625
⇒ BC ² = 625 – 49
⇒ BC ² = 576
∴ BC = \(\sqrt{576}\) = 24 cm
Thus, the required length of BC = 24 cm.

Ex 6.5 Class 7 Maths Question 3.
A 15 m long ladder reached a window 12 m high from the ground on placing it against a wall at a distance a. Find the distance of the foot of the ladder from the wall.

Solution:
Here, the ladder forms a right angled triangle.
∴ a ² + (12) ² = (15) ² (By Pythagoras property)
⇒ a ² + 144 = 225
⇒ a2 = 225 – 144
⇒ a ² = 81
∴ a = \(\sqrt{81}\) = 9 m
Thus, the distance of the foot from the ladder = 9m

Ex 6.5 Class 7 Maths Question 4.
Which of the following can be the sides of a right triangle?
(i) 2.5 cm, 6.5 cm, 6 cm.
(ii) 2 cm, 2 cm, 5 cm.
(iii) 1.5 cm, 2 cm, 2.5 cm
Solution:
(i) Given sides are 2.5 cm, 6.5 cm, 6 cm.
Square of the longer side = (6.5) ² = 42.25 cm.
Sum of the square of other two sides
= (2.5) ² + (6) ² = 6.25 + 36
= 42.25 cm.
Since, the square of the longer side in a triangle is equal to the sum of the squares of other two sides.
∴ The given sides form a right triangle.

(ii) Given sides are 2 cm, 2 cm, 5 cm .
Square of the longer side = (5) ² = 25 cm Sum of the square of other two sides
= (2) ² + (2) ² =4 + 4 = 8 cm
Since 25 cm ≠ 8 cm
∴ The given sides do not form a right triangle.

(iii) Given sides are 1.5 cm, 2 cm, 2.5 cm
Square of the longer side = (2.5) ² = 6.25 cm Sum of the square of other two sides
= (1.5) ² + (2) ² = 2.25 + 4
Since 6.25 cm = 6.25 cm = 6.25 cm
Since the square of longer side in a triangle is equal to the sum of square of other two sides.
∴ The given sides form a right triangle.

Ex 6.5 Class 7 Maths Question 5.
A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of 12 m from the base of the tree . Find the original height of the tree.
Solution:
Let AB be the original height of the tree and broken at C touching the ground at D such that

AC = 5 m
and AD = 12 m
In right triangle ∆CAD,
AD ² + AC ² = CD ² (By Pythagoras property)
⇒ (12) ² + (5) ² = CD ²
⇒ 144 + 25 = CD ²
⇒ 169 = CD ²
∴ CD = \(\sqrt{169}\) = 13 m
But CD = BC
AC + CB = AB
5 m + 13 m = AB
∴ AB = 18 m .
Thus, the original height of the tree = 18 m.

Ex 6.5 Class 7 Maths Question 6.
Angles Q and R of a APQR are 25° and 65°. Write which of the following is true.
(i) PQ ² + QR ² = RP ²
(ii) PQ ² + RP ² = QR ²
(iii) RP ² + QR ² = PQ ²

Solution:
We know that
∠P + ∠Q + ∠R = 180° (Angle sum property)
∠P + 25° + 65° = 180°
∠P + 90° = 180°
∠P = 180° – 90° – 90°
∆PQR is a right triangle, right angled at P
(i) Not True
∴ PQ ² + QR ² ≠ RP ² (By Pythagoras property)
(ii) True
∴ PQ ² + RP ² = QP ² (By Pythagoras property)
(iii) Not True
∴ RP ² + QR ² ≠ PQ ² (By Pythagoras property)

Ex 6.5 Class 7 Maths Question 7.
Find the perimeter of the rectangle whose length is 40 cm and a diagonal is 41 cm.

Solution:
Given: Length AB = 40 cm
Diagonal AC = 41 cm
In right triangle ABC, we have
AB ² + BC ² = AC ² (By Pythagoras property)
⇒ (40) ² + BC ² = (41) ²
⇒ 1600 + BC ² = 1681
⇒ BC ² = 1681 – 1600
⇒ BC ² = 81
∴ BC = \(\sqrt{81}\) = 9 cm
∴ AB = DC = 40 cm and BC = AD = 9 cm (Property of rectangle)
∴ The required perimeter
= AB + BC + CD + DA
= (40 + 9 + 40 + 9) cm
= 98 cm

Ex 6.5 Class 7 Maths Question 8.
The diagonals of a rhombus measure 16 cm and 30 cm. Find its perimeter.

Solution:
Let ABCD be a rhombus whose diagonals intersect each other at O such that AC = 16 cm and BD = 30 cm
Since, the diagonals of a rhombus bisect each other at 90°.
∴ OA = OC = 8 cm and OB = OD = 15 cm
In right ∆OAB,
AB ² = OA ² + OB ² (By Pythagoras property)
= (8) ² + (15) ² = 64 + 225
= 289
∴ AB =\(\sqrt{289}\)= 17 cm
Since AB = BC = CD = DA (Property of rhombus)
∴ Required perimeter of rhombus
= 4 × side = 4 × 17 = 68 cm.

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