CBSE students can refer to NCERT Solutions for Class 7 Maths Chapter 10 Practical Geometry Ex 10.4 Textbook Questions and Answers are provided by experts in order to help students secure good marks in exams.
Class 7 Maths NCERT Solutions Chapter 10 Practical Geometry Ex 10.4
Ex 10.4 Class 7 Maths Question 1.
Construct ∆ABC, given m∠A = 60°, m∠B = 30° and AB = 5.8 cm.
Steps of Construction :
1. Draw a line segment AB = 5.8 cm.
2. Draw ∠BAX = 60°.
3. Draw ∠ABY, with Y on the same side of AB such that ∠ABY = 30°.
4. Let AX and BY interest at C. Then, ∆ABC is the required triangle.
Ex 10.4 Class 7 Maths Question 2.
Construct ∆PQR if PQ = 5cm, m ∠PQR = 105° and m ∠QRP = 40°.
Here, we are given the side PQ, ∠Q, and ∠R. But to draw the triangle, we require ∠P
Ex 10.4 Class 7 Maths Question 3.
Examine whether you can construct
∆DEF such that EF = 7.2 cm, m∠E = 110° and m∠F = 80°. Justify your answer.
Since m∠E +m∠F = 110° + 80° = 190°
so the ∆DEF cannot be drawn as the sum of all the angles of a triangle is 180°.