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Lesson Example Discussion Quiz: Class Homework

Lesson

Title: Angles

Grade: 8-a Lesson: S3-L7

Explanation: Hello Students, time to learn definitions. Let us take turns and read definitions and explain the pictures. Try to remember or memorize the definitions. Pay special attention to the pictures and communicate in your own words.

Lesson:

Definition: Angles

An angle is a fundamental geometric concept that measures the rotation between two intersecting lines or line segments.

The angle is typically denoted using the symbol "θ" (theta) or sometimes "∠ABC," where "A," "B," and "C" are three points on the rays, with "B" being the vertex.

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Explanation: An acute angle measures less than 90° at the vertex.
An obtuse angle is between 90° and 180°.
A right angle precisely measures 90° at the vertex.
An angle measuring exactly 180° is a straight angle.
A reflex angle measures between 180°- 360°.
A complete angle measure equals 360°.

Tip Angles

The measurement of an angle is given in degrees (°) or radians (rad).