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.