Triangles Worksheet for Class 6

# Triangles Worksheet for Class 6

## Triangles Worksheet for Class 6

Triangles Worksheet for Class 6 plays a vital role in strengthening the maths concepts. After studying the concepts of mathematics, revision of Triangles Worksheet for Class 6 is very important for the students. This assesses the preparation of the students. Students can assess themselves by its own by solving the Triangles Worksheet for Class 6. Parents and teachers can also assess the students by giving them these Triangles Worksheet for Class 6 to solve.

Maths-formula.com brings the such Triangles Worksheet for Class 6 for you. By solving these worksheets, you can increase the understanding of the concepts learnt. These Triangles Worksheet for Class 6 are prepared by experienced teachers and subject matter experts. If you can solve the 90% of the questions correctly, it means your preparation is very good.

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## Triangles Worksheet for Class 6 with Answers

Worksheet 1

1. Fill in the blanks:

a. A triangle in which exactly two sides are equal is called ___________ triangle.

b. In an acute-angled triangle, the number of acute angles is ___________.

c. The sum of the angles of a triangle is ___________.

d. The angles opposite to the equal sides of triangle are ___________.

2. Fill in the blanks for each of the following:

a. In a triangle, if one side is produced, the exterior angle so formed is equal to the sum of the two ___________ opposite angles.

b. A triangle with its sides as 6.5 cm, 5.8 cm and 6.5 cm is a/an ___________ triangle.

c. A triangle with two angles 75° and 65° has its third angle as ___________.

d. The sum of any two sides of a triangle is ___________ than the third side.

3. State true or false for each of the following:

a. The hypotenuse is the largest side of a right triangle.

b. The sum of the angles of a triangle equal to 360°.

c. If the sides of a triangle measures 6 cm, 8 cm and 10 cm, then it is a right-angled triangle.

d. The third angle of a triangle whose two angles measured 100° and 40° is 40°.

4. How many triangles are there in the figure?

5. Find the value of x and y in the following figures.

6. Draw a triangle and mark points in interior and exterior of the triangle.

Worksheet 2

1. If two angles of a triangle PQR are 60° and 45°, what is the measure of the third angle? What type of triangle is PQR?

2. Fill in the blanks in each of the following:

a. A triangle whose angles measure 35°, 55°, 90° is a/an ___________ triangle.

b. A triangle whose angles measure 60°, 60°, 60° is a/an ___________ triangle.

c. An ___________ angled triangle has all its angles measuring less than 90°.

d. If one angle of a triangle is obtuse then the other two are ___________.

3. Find the unknown marked angles in each of the following:

4. Find the unknown angles marked by letters:

5. Find the measurement of unknown angles:

6. In triangle ABC, AB = AC. AD bisecting BAC meets BC at D. If ABC = 72°. Find ACB and BAD.

7. In an isosceles triangle, each base angle is equal to 40°. What is the measure of the vertical angle?

8. Can the numbers given below be sides of a triangle?

a. 3, 5, 9

b. 7, 8, 6

9. Choose the correct answer for each of the following:

a. A scalene triangle has

i. all sides equal

ii. all sides unequal

iii. two sides equal

iv. all angles equal.

b. If one angle of a triangle is greater than 90°, then it is called an

i. obtuse-angled triangle

ii. acute-angled triangle

iii. right-angled triangle

iv. equilateral triangle

c. Sum of the angles of a triangle add up to

i. 90°

ii. 180°

iii. 270°

iv. 360°

d. If two angles of a triangle are 55° and 35°, then the third angle measures

i. 60°

ii. 90°

iii. 100°

iv. 80°

Worksheet 3

1. Choose the correct answer for each of the following:

a. If the vertex angle of an isosceles triangle equal to 80°, then each base angle is equal to

i. 50°

ii. 100°

iii. 60°

iv. 40°

b. If the angles of a triangle are x, 2x and 3x, then x is equal to

i. 90°

ii. 50°

iii. 30°

iv. 60°

c. The angles of a triangle are in the ratio 1 : 3 : 5, then the largest angle measures

i. 90°

ii. 20°

iii. 80°

iv. 100°

d. The angles of a triangle are x = y = z, then the triangle is an

i. isosceles triangle

ii. right-angled triangle

iii. equilateral triangle

iv. obtuse-angled triangle

2. State true or false:

a. An equilateral triangle has one obtuse angle.

b. If the base angles of an isosceles triangle equal to 66° each, then the vertical angle is 48°.

c. In a right-angled triangle, the other two angles are obtuse.

d. If the angles of a triangle are 5x, 4x and 3x, then the value of x is 15°.

3. Match the following with the correct given options:

a. 4x, 115°, 25° are the angles of a triangle therefore x is equal to    i. unequal

b. All angles of a scalene triangle are                                                ii. 10°

c. Angles opposite the equal sides of a triangle are                          iii. 60°

d. Each angle of an equilateral triangle is                                         iv. equal

e. Exterior angle corresponding to an acute angle of a triangle is    v. obtuse

4. Find the value of unknown angles.

5. In the given figure, there are three triangles. Find all the unknown angles.

6. Angles of a triangle are in the ratio 8 : 7 : 3. Find the angles.

7. AG and DH are two parallel lines. Show that triangles ABC and CDE are two isosceles tri­angles.

Worksheet 1

1. a. isosceles     b. three

c. 180°             d. equal

2. a. interior       b. isosceles

c. 40°               d. greater

3. a. True       b. False

c. True       d. True

4. 16 triangles

5. a. x = 70°, y = 60°

b. x = 45°, y = 80°

6. Do it yourself

Worksheet 2

1. 75°; Acute-angled triangle

2. a. right-angled

b. equilateral

c. acute

d. acute

3. a. x = 28°     b. x = 30°

4. i. a = 80°; r = 40°

ii. x = 28°

5. a. x = 100°, y = 30°

b. x = 50°

6. ACB = 72°; BAD = 18°

7. 100°

8. a. No       b. Yes

9. a. ii         b. i

c. ii         d. ii

Worksheet 3

1. a. i           b. iii

c. iv          d. iii

2. a. False     b. True

c. False     d. True

3. a. ii           b. i

c. iv          d. iii

e. v

4. a. 48°, 60°, 72°

b. x = 70°, y = 40°, z = 40°

5. ACB = DCE = 43°

DEC = FEG = 57°

EFG = 53°

6. 80°, 70°, 30°

7. ABC = ACB = 70°

CDE = DCE = 70°

Therefore, ABC and CDE are two isosceles tri­angles.

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