Triangles Quiz - CBSE Class 8 Mathematics

Free practice quiz: Triangles (CBSE Class 8 Mathematics). 16 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the sum of the interior angles of a triangle?

   1. 90 degrees
   2. 180 degrees
   3. 270 degrees
   4. 360 degrees
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   Answer: B. 180 degrees

   The sum of the interior angles of a triangle is always 180 degrees regardless of the type of triangle.

2. A triangle has angles measuring 50° and 60°. What is the measure of the third angle?

   1. 70°
   2. 80°
   3. 90°
   4. 100°
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   Answer: A. 70°

   The sum of angles in a triangle is always 180°. Therefore, the third angle = 180° - (50° + 60°) = 70°.

3. A triangle has sides measuring 3 cm, 4 cm, and 5 cm. What type of triangle is it?

   1. Equilateral triangle
   2. Scalene triangle
   3. Right triangle
   4. Isosceles triangle
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   Answer: C. Right triangle

   This triangle satisfies the Pythagorean theorem: 3² + 4² = 9 + 16 = 25 = 5², so it is a right triangle.

4. In an equilateral triangle, if one angle measures 60°, what are the measures of the other two angles?

   1. 60° each
   2. 45° each
   3. 90° each
   4. 30° each
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   Answer: A. 60° each

   An equilateral triangle has all angles equal, hence if one angle is 60°, the other two angles are also 60°.

5. If the area of a triangle is 24 cm² and its base is 8 cm, what is its height?

   1. 3 cm
   2. 4 cm
   3. 6 cm
   4. 8 cm
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   Answer: C. 6 cm

   Using the area formula: Area = 1/2 × base × height, we can find the height. Thus, 24 = 1/2 × 8 × height, which means height = 6 cm.

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