Angles: measuring angles and their names! | Educational Videos for Kids
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What are you waiting for? We measure Angles with... a protractor! Have you ever used one before? Here's how!
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Hello friends! Welcome to a new Happy Learning video.
Look at these images, do you know what we are looking at?
Exactly! They are angles! And today, we are going to learn many things about them.
An angle is the space between two intersecting lines or surfaces that emerge from the same point called vertex.
If you look around, we are surrounded by angles, like the ones a clockโs handles or an ice-cream cone makes.
The unit of measure of the angles is the degree, and the most important angle of all, is this oneโฆ itโs called a right angle and it measures 90 degrees. The tiny zero you can see on the right upper part of the number 90 is the symbol that represents all angles.
We say that a right angle is the most important one because it is the one that is used to compare all of the other angles.
The angles that are smaller than a right angle are called acute angles, and they measure less than 90 degrees. likeโฆ all of theseโฆ
And the angles that are bigger than a right angle are called obtuse angles and measure more than 90 degreesโฆ like all of theseโฆ
To know the degrees that an angle measures, we need to use this instrumentโฆ which is called a protractor.
So, to know the degrees that an angle measures, we need to place the straight part of the protractor over one of the sides of the angle, making the vertex and the central point of the protractor meet. After this, we need to look at the protractor line that coincides with the other side of the angle and look at what number it says. These are the degrees that this angle measures. Easy peasy huh?
Letโs practice! We said that a right angle is 90 degreesโฆ Letโs seeโฆ Weโll get the protractor andโฆ Indeed! a right angle is 90 degrees, we havenโt fooled you huh?
Now letโs measure this angle, letโs see how much it measures. 45 degrees! itโs an acute angle, because it is smaller than a right angle.
And now, weโre going to check out how much this other angle measuresโฆ It measures 120 degrees, of course! itโs an obtuse angle because it measures more than 90 degrees.
Imagine that instead of it being 120 degrees it measuresโฆ 180! Do you know what this angle is called? Well itโs called a straight angle.
Hey! and what about if it measures 360 degrees?
Well thatโs a complete or full angle, itโs complete as can be. A circumference measures 360 degrees. What a discovery!!!
Measuring angles is easy peasyโฆ and fun! Donโt you think?
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