Different Types of Geometric Angles: Math Lesson for Kids

What is an Angle

Angles in Geometric expression can be defined as the figure formed when two ‘rays’ meet at a common point. The common point is called as the ‘node’ or ‘vertex’ and the two rays are called as arms of the angle. Angle is denoted by the symbol ‘∠’.

Degrees of an Angle

Angle is measured in ‘degrees’ with the help of a protractor. The measure of an angle and its degree is determined by the rotation of the ‘rays’. Children are initially introduced to degrees 30°, 45°, 60°, 90°, 180°, 360° which they learn to measure with the help of a protractor.

Types of Angles

There are six types of angles in geometry which are as follows:

Acute Angle

Is formulated when the angle is between 0° to 90°

Acute angle

Obtuse Angle:

When the angle is more than 90° and up to 180°

Obtuse angle

Right Angle

This angle is exactly equal to 90° and the ray rises up vertically

Right Angle

Reflex Angle

The angle which is greater than 180° and less than 360°

Reflex Angle

Straight Angle

An angle exactly equal to 180° forms a straight line & is called a straight angle

Straight Angle

Full Rotation

The complete rotation of angle equal to 360° degrees and makes a circle

Full Rotation

Interesting Lesson Plans for Kids

Measure the Angles in the Picture

Draw or print a picture of an animal/object and ask students to mark out the different angles that they observe. Students will discover more than one angles in the image and they must use a highlighter to mark it and identify whether it is an acute, obtuse, reflex, or right angle. They can even measure the degree with the help of a protractor.

Tape It: Shape It

Use a floor marking tape and make patterns on the classroom floor with it. The free-hand patterns must form some sort of angle, that is identifiable. Make chits and write the names of different angles on them (acute, obtuse, right, etc.). Ask the child to pick up a chit and stand at the ‘vertex’ which forms the angle. For example, if the chit says ‘acute angle’ the child stands on the ‘vertex’ where the rays form an acute angle.

Art Attack

Take origami paper of different colors and make a fan shape by folding alternate folds in & out. Now if you want to show acute angle, then children will need to make an ‘acute model’ with the origami paper and stick the ends accordingly. To make a 360° full rotation, they will open the paper like a fan, such that it becomes a circle and then stick the ends of the paper.

Exercise Your Arm

This is like a workout session, where students have to adjust their arms to form the angle which the teacher calls out. So, for ‘right angle’, one arm is stretched vertically straight about the ceiling and the other is stretched out horizontally. When the teacher says to make an acute angle, one arm is stretched horizontally and the other slightly tilted lesser than 90°.

If you don’t have the time to devise these geometric activities to teach your child about ‘angles’, simply subscribe to the Mathletics app. Here you will find interesting ‘gamified’ tasks which intrigue the learners and drive them to attempt solving the ‘puzzle’ and in the bargain revising the concept of ‘angles’. This platform is pretty popular in UAE and other Middle East countries and parents are satisfied with the improvement in learning it brings to children.

Real-World Application of Geometric Angles

Construction of Buildings

The construction and engineering of dams, skyscrapers, and highways wouldn’t have been possible if it wasn’t for those genius architects & civil engineers applying concepts of geometric shapes and angels while designing the structure on their drawing board.

Graphic Designing

A graphic designer has to visualize how the ‘printed standee or hoarding’ would look in different ‘angles’ once it is put up in place and for this he has to have basic knowledge about geometric shapes & patterns.


Abstract art that takes inspiration from geometric forms is intricately thought through by artists before they portray this self-expression & display it on a canvas. Therefore, even artists need to know a lot about ‘symmetric shapes’ for which the knowledge of ‘angles’ comes into play.

So now that we know how important it is for learners to understand the concept of ‘angles’ and to measure ‘degrees’, it’s time to subscribe to Mathletics and let children have fun while discovering this topic in detail.

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