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Transcript of ANGLES!!!
We are going to learn about angles. There are
types of angles:
angles. We are even going to learn the facts about angles, like protrators and other things like that. Let's Start.
Now on to the angles
An acute angle is smaller than 90 degrees
on a protractor. It is the smallest type of angle, that's why it's called an a
There is an acute angle on this flag
smaller (<) than 90 degrees is an acute
Now for the Angle that is exactly 90 degrees.
Can you guess which angle it is?
A right angle is exactly 90 degrees. Even if it's 1 degree off it's not a right angle. It's the angle in the middle because a protractor goes only up to 180 degrees. There isn't a lot for the right angle. But it is important.
What does "Obtuse" mean to you? Hurry up, Cause it's next!!!
An Obtuse angle is larger than a right angle, so
technically it is greater than 90 degrees and smaller than 180 degrees. When i hear the word obtuse, it reminds me of something large. It is a big angle and it even looks like one.
(>) = bigger than
(<) = smaller than
What angle is exactly 180 degrees and is like a straight line? Think fast because we've got to move on, the straight angle won't stay for long!
A straight angle might look boring, but it is pretty important because it is exactly 180 degrees. like the right angle, of you are off even one degree it's not a straight angle. This angle is the last number on the protractor. Anything above or below 180 degrees is not the STRAIGHT ANGLE. It becomes a different type of angle.
Learning about a straight angle is easy, so let's move on.
There is an angle that has fell of the
protractor!!! What is it???
Oh, The reflex angle is bigger than 180 degrees. That is past the protractor limit! No wonder it couldn't fit on the pro tractor. Reflex angle is bigger than 180, but smaller than 360. If it was 360 degrees it would be a full circle!
On angles above 180 degrees the shield that covers the vertex looks like: It is never goes over the shape of a semi circle.
On a reflex angle, it looks like: The shape is more than a semicircle.
As long as it is on a table, it
won't fall down.... hopefully.
Here are some of the basic's that you neeeed
This is a protractor
degrees is the middle of this
protractor because it goes up to
It skip count's by
You know the half circle at
the bottom and the line in the middle, that's where the vertex goes. Then the top arm points to
of the tiny dashes on the rim.
That's all you need to know about protractors... so far
Here are some basic things that relate to angles.
You need to know these before
if that's okay with you...
Labeling an angle
Let me paraphrase this picture for you: The sides of an
angle are called arms or rays. They give the angle it's
shape. There is dot at the point where the angles meet. It is called a vertex. You put down the vertex with your pencil and from there you add your arms or rays.
Parts of an Angle
Parts of an angle
These are the title's of the basic's
You must be wondering about labeling angles because we're labeling angles here. Anyways, you should stay because this is important. You always draw the letter B at the vertex. ALWAYS! A and C go on the arms. One letter on one arm, not two. The A can go one which
ever arm you like. Same goes for the C. Using the diagram helps a lot. It's pretty simple.
How To Draw An Angle
If you want to draw a perfect angle, you need some stuff. Like a ruler and a protractor. First you place the protractor's middle line (at the bottom) on the vertex. Then use a ruler a to draw a straight line upward. After that you need to match the bottom arm with the bottom line on the protractor. Finally you remove your protractor and label your angle. You've got a cool angle. That's it for now.
How to draw an angle
And thanks for watching