# Angles

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• There are angles in most shapes and in many of the objects you see and use on a daily basis.
• Angles are measured in degrees.
• There are four types of angles:
• Acute angle
• Obtuse angle
• Right angle
• Straight angle

## Right angle      • When two straight lines are perpendicular to each other or make 90° with each other, then they are said to be at right angles.
• A right angle is exactly 90°.
• Right angles are often shown with a box in the corner.
• Squares and rectangles are formed using right angles.
• Some real life examples of Right angles are :-

## Acute angle

When two straight lines make an angle with each other such that it is greater than 0° and less than 90°, then these lines are said to be making an acute angle with each other.    • Acute angles are less than 90°.
• Some triangles have acute angles.
• Here are few examples: The slice of pizza that you eat for lunch is an acute angle.
• You get a new box of pencils for school. After you sharpen all of the pencils you notice that the tips are acute angles.

## Obtuse angle     • When two straight lines make an angle with each other such that it is greater than 90° and less than 180°, then these lines are said to be making an obtuse angle with each other.
• Obtuse angles are more than 90° but less than 180°.
• Many shapes such as pentagons, octagons and triangles have obtuse angles.
• Lets see some examples of obtuse angles.

## Straight angle • When two line segments point exactly in the opposite direction and form a single straight line, then the angle they form is 180° or straight angle.

## Angles

• Angles are formed when two rays meet.
• If there are two straight rays such that they have a common end point, then the amount of curl between these two lines is known as 'angle'.
• There are four types of angles:
• Acute angle
• Obtuse angle
• Right angle
• Straight angle
• When two straight lines are perpendicular to each other or make 90° with each other, then they are said to be at right angles.
• When two straight lines make an angle with each other such that it is greater than 0° and less than 90°, then these lines are said to be making an acute angle with each other.
• When two straight lines make an angle with each other such that it is greater than 90° and less than 180°, then these lines are said to be making an obtuse angle with each other.
• When two line segments point exactly in the opposite direction and form a single straight line, then the angle they form is 180° or straight angle.
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