An angle is the space or turn between two straight lines that meet at one point. The point where they meet is called the vertex, and the lines are called the arms. In geometry, there are four main types of angles that you see every day. The Four Main Angles
We measure angles in degrees (°), from 0 up to 360. Here are the main ones:
Right Angle: This angle looks like a perfect corner. It measures exactly 90°. You can see it on the corner of a book, a door, or a square box.
Acute Angle: This is a sharp angle that is smaller than 90°. The word “acute” means sharp. Think of a slice of pizza or the beak of a bird.
Obtuse Angle: This is a wide angle. It is larger than 90° but less than 180°. Examples include the hands of a clock showing 4:00 or a wide-open laptop.
Straight Angle: This angle looks like a flat line. It measures exactly 180°. It is made when two lines open up completely flat in opposite directions. Other Angles to Know
If you open an angle even further past a straight line, you get two other types:
Reflex Angle: This angle is bigger than a flat line but not a full circle. It measures between 180° and 360°.
Full Rotation: This is a complete circle. It measures exactly 360°. Think of a wheel spinning all the way around once. Types of Angles: Acute, Right, Obtuse & Straight Explained
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