SCERT AP 7th Class Maths Solutions Pdf Chapter 5 Triangles Ex 5.1 Textbook Exercise Questions and Answers.

## AP State Syllabus 7th Class Maths Solutions 5th Lesson Triangles Exercise 5.1

Question 1.

Classify the following triangles based on the length of their sides.

Answer:

In ∆ABC,

AB ≠ BC ≠ AC

So, ∆ABC is scalene traingle.

Answer:

In ∆DEF,

DE = EF = FD = 2 cm

So, ∆DEF is an equilateral triangle.

Answer:

In ∆XYZ,

XZ = YZ = 3.5 cm

So, ∆XYZ is an isosceles triangle.

Answer:

Isosceles triangle (∵ Two sides are equal)

Answer:

Equilateral triangle (∵ Three sides are equal)

Answer:

Scalene triangle (∵ NO two sides are equal).

Question 2.

Classify the following triangles based on the measure of angles.

Answer:

In ∆TUV, ∠T = 90°

So, ∆TUV is Right-angled triangle.

Answer:

In ∆QRS, ∠Q = 108°

So, ∆QRS is an Obtuse angled triangle.

Answer:

In ∆IJK, all are acute angles.

So, ∆IJK is an acute angled triangle.

Question 3.

Classify the following triangles based on their sides and also on their angles.

Answer:

In ∆IJK, IJ ≠ KJ ≠ IK

So, ∆IJK is a scalene triangle.

Answer:

In ∆LMN, ∠M = 90

So, ∆LMN is a right triangle.

Answer:

In ∆TUV, TU = UV = TV = 4.5 cm

So, ∆TUV is an equilateral triangle.