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Chapter 12 Worksheet 1 | Triangles | Class-6 DAV Secondary Mathematics
Unit 12 Worksheet 1 || Triangles
1. Draw any triangle XYZ and name Its sides, angles and vertices.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-346.png)
2. How many triangles are there In each of the following figures.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-92.png)
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-347.png)
3. Identify the following triangles on the basis of their angles.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-93.png)
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-345.png)
4. Can we construct a triangle with angles of measure 70°, 40°, 60°? Why or Why not?
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-348.png)
5. Can you construct a triangle using line segments of the following lengths.
(a) 7 cm, 6 cm, 12 cm (b) 6 cm, 5 cm, 11 cm
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-349.png)
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-350.png)
6. One of the angles of a right angled triangle is 40°. Find the other angles of the triangle.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-387.png)
7. Two angles of a triangle measure 30° and 55° respectively. Find the measure of the third angle. Also state what type of a triangle is it.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-388.png)
8. Write ‘True’ or ‘False’ for the following statements.
(a) The sum of three angles of a triangle is always equal to 180°.
(b) A triangle can have two of its angles greater than 90°.
(c) Equilateral triangle has all of its three sides equal in length.
(d) One angle of a right angled triangle is always equal to 90°.
(e) A triangle whose all the three sides are different in length is called an isosceles triangle.
![Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics Chapter 12 | Triangles | Class-6 DAV Secondary Mathematics](https://ncertbookspdf.com/wp-content/uploads/2022/01/image-389.png)