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# Name the types of following triangles:

(а) Triangle with lengths of sides 7 cm, 8 cm, and 9 cm.

(b) ∆ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm.

(c) ∆PQR such that PQ = QR = PR = 5 cm.

(d) ∆DEF with m∠D = 90°

(e) ∆XYZ with m∠Y = 90° and XY = YZ.

(f) ∆LMN with m∠L = 30°, m∠M = 70° and m∠N = 80°.

**Solution:**

We will use the properties of triangles and types of triangles to solve this.

(a) The triangle is a scalene triangle since the sides of the given triangle are all of different lengths.

(b) ∆ABC is a scalene triangle since AB ≠ AC ≠ BC

(c) The triangle is an equilateral triangle since all the sides of the triangle are equal.

(d) The triangle is a right-angle triangle since ∠D = 90°

(e) The triangle is an isosceles right-angled triangle since ∠Y = 90° and XY = YZ

(f) The triangle is an scalene acute triangle since ∠L = 30°, ∠M = 70° and ∠N = 80°.

NCERT Solutions for Class 6 Maths Chapter 5 Exercise 5.6 Question 1

## Name the types of following triangles: (а) Triangle with lengths of sides 7 cm, 8 cm, and 9 cm. (b) ∆ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm. (c) ∆PQR such that PQ = QR = PR = 5 cm. (d) ∆DEF with m∠D = 90° (e) ∆XYZ with m∠Y = 90° and XY = YZ. (f) ∆LMN with m∠L = 30° m∠M = 70° and m∠N = 80°.

**Summary:**

(a) The triangle is a scalene triangle since the sides of the given triangle are different. (b) ∆ABC is a Scalene triangle since AB ≠ AC ≠ BC (c) The triangle is an equilateral triangle since all the sides of the triangle are equal. (d) The triangle is a right-angle triangle since ∠D = 90°. (e) The triangle is an isosceles right-angled triangle since ∠Y = 90° and XY = YZ. (f) The triangle is an scalene acute since ∠L = 30°, ∠M = 70° and ∠N = 80°.

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