Ans. Angles are geometric figures formed by two rays or lines which have a common endpoint. The common endpoint is called the vertex of the angle, and the two rays are called the arms or sides of the angle.

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What are Angles? Video Lecture - Class 4

Video Timeline

00:03	What are Angles?
00:31	Arms of an Angle
00:54	Vertex of an Angle
01:06	Angles in everyday life

FAQs on What are Angles? Video Lecture - Class 4

1. What are angles?

2. What are the different types of angles?

Ans. There are four types of angles- acute angle, right angle, obtuse angle, and straight angle. An acute angle is less than 90 degrees, a right angle is exactly 90 degrees, an obtuse angle is greater than 90 degrees but less than 180 degrees, and a straight angle is exactly 180 degrees.

3. How to measure an angle?

Ans. Angles can be measured using a protractor. Place the protractor on the angle with the vertex at the center of the protractor and one of the arms along the baseline of the protractor. Read the number on the protractor where the other arm of the angle intersects the protractor.

4. What is the sum of angles in a triangle?

Ans. The sum of angles in a triangle is always 180 degrees. This is known as the Triangle Sum Theorem. Therefore, if we know the measures of two angles in a triangle, we can find the measure of the third angle by subtracting the sum of the first two angles from 180 degrees.

5. What are complementary and supplementary angles?

Ans. Complementary angles are two angles whose sum is 90 degrees. For example, if one angle measures 45 degrees, the other angle measures 45 degrees as well. Supplementary angles, on the other hand, are two angles whose sum is 180 degrees. For example, if one angle measures 120 degrees, the other angle measures 60 degrees.

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Apr 29, 2025 Last updated

What are Angles? for Class 42025 is part of Class 4 preparation. The notes and questions for What are Angles? have been prepared according to the Class 4 exam syllabus. Information about What are Angles? covers all important topics for Class 42025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for What are Angles?.

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Video Timeline

00:03	What are Angles?
00:31	Arms of an Angle
00:54	Vertex of an Angle
01:06	Angles in everyday life

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