Circle theorems #2

Hello thriving mathematicians :)
As I well and truly said, here is another circle theorems post!!

It is a very simple post, but holds valuable information for you to be able to smash you GCSE'S!!!!!!!!

Parts of a circle!
When somebody asks you 'Name the parts of a circle' the majority of people would say area and perimeter. The odd few will say radius and diameter. But how many of you actually name more that 2. How about 11? Yeah!!!!!!!!!

Well, here is a list!!!

• The circle itself! Also known as the circumference.
• Centre
• Radius 
• Diameter
• Arc
• Chord 
• Sector
• Segment (Minor and Major)
• Tangent
• Quadrant 
• Semi Circle

With some exam boards you only need to know a small minority of these and there formulas.
Lets see some pictures! -with an explanation!

Just around the circle is the circumference!
Instead of calling it the perimeter we call it circumference!!

There is nothing I can really say about this.
The red dot is the centre:)

Repost of the radius and diameter. Radius is from centre to circumference and diameter is from edge-edge.

The red line is called the arc!!!!

2 In 1! The red line is called the chord. It is from edge-edge!
The pink section is the segment.

The Blue section is called the sector.

There is a line that joins onto the bottom of a circle, not permanently of course.
Bit it is a line. A simple line. Called Tangent

Now, you may see this as a sector. But any clever mathematician would know it is in fact a quadrant .
This is one you don't really need to know, but it is good to anyway!

And the final one is in fact a semi circle.
Which is just half a circle, no more, no less!





That is it for today's post! But something is definitely missing! Yeah, CIRCLE ANGLES!!
Next post ya? And no I don't just mean a circle has a 360 degree angle. Nope there are so much more!
Circle theorems have a lot! Right?
Believe me we have been doing these the past 4 lessons in maths and I'm sure there are more to come!
Hope you've all had a wonderful Easter, and a lovely Easter Holiday / Spring Break and are all eager to get back to school!! See you next post ;)

Thanks for Reading!