Triangles Quiz - CBSE Class 6 Mathematics
Free practice quiz: Triangles (CBSE Class 6 Mathematics). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This CBSE Class 6 Mathematics practice quiz has 10 multiple-choice questions on Triangles, and 10 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.
Start quiz: 10 questions, freeLearn the key ideas Beta
Angle sum of a triangle
- A triangle is a closed shape with sides a, b, c and corners A, B, C.
- Its interior angles always add up to one straight angle, which equals two right angles.
- To find a missing angle, subtract the known angles from a straight angle.
Common mistake: Subtracting only one known angle from the straight angle and forgetting to subtract the other one.
Types of triangles
- By sides: scalene has no equal sides, isosceles has two equal sides, equilateral has all sides equal.
- By angles: acute has all angles acute, right has one right angle, obtuse has one obtuse angle.
- An equilateral triangle also has all its angles equal.
Common mistake: Calling a shape like a square or rectangle a type of triangle. Those are quadrilaterals, not triangles.
Checking for a right triangle
- Take the longest side c and the other two sides a and b.
- If c squared equals a squared plus b squared, the triangle has a right angle.
Common mistake: Choosing a shorter side as c. The side c must always be the longest side.
Area using base and height
- The height is the perpendicular distance from the base to the opposite corner.
- Area is half of base times height, written in square units like cm^2.
Common mistake: Forgetting to take half of base times height, or using a slanted side instead of the perpendicular height.
Heron's formula for area
- Use it when all the side lengths a, b, c are known but the height is not.
- First find s, the semi-perimeter, which is half the sum of all the sides.
Common mistake: Using the full perimeter instead of half of it for s, which gives a wrong area.
Exam tips
- Always write area in square units, such as cm^2.
- Before choosing a type, check both the sides and the angles of the triangle.
- With Heron's formula, find s, then each of s-a, s-b and s-c.
Beta: made with AI and checked by a second AI. A teacher has not reviewed it yet.
Sample questions
What is the sum of the angles in a triangle?
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Answer: B. 180 degrees
In any triangle, the sum of the interior angles always equals 180 degrees.
How many sides does a triangle have?
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Answer: B. 3
A triangle is defined as a polygon with three edges and three vertices.
A triangle has sides of lengths 3 cm, 4 cm, and 5 cm. What type of triangle is this?
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Answer: D. Right
This triangle follows the Pythagorean theorem (3^2 + 4^2 = 5^2), which means it's a right triangle.
A triangle has two equal sides of length 6 cm. If the base is 8 cm, what is its type?
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Answer: B. Isosceles
Since two sides are equal in length, this triangle is classified as isosceles.
Calculate the area of a triangle with a base of 12 cm and a height of 10 cm.
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Answer: A. 60 cm²
The area is found using the formula: (base × height) / 2 = (12 × 10) / 2 = 60 cm².
More questions in this quiz
Answers and explanations are in the full quiz.
- If a triangle has angles of 60 degrees and 30 degrees, what is the measure of the third angle?
- Which of the following is NOT a type of triangle?
- If the base of a triangle is 10 cm and the height is 5 cm, what is the area?
- What is the measure of each angle in an equilateral triangle?
- A triangle has sides measuring 7 cm, 8 cm, and 9 cm. Use Heron's formula to find the area.
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