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Learn
More - FAQs
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Now!
Above is a picture of a circle. See those two lines? The short one’s the radius and the long one the diameter. The actual line making the circle is called the circumference. The line below the circle is called a tangent. Read on…
"Ah. This looks familiar. I seem to remember seeing this somewhere before. But it’s got different labels" That’s right. The diagram tells you some different parts of the circle. STUDY IT! Please. Oh, and you pronounce chord "cord".
Here are some important things to remember about the circle in GCSE, they’ll win you marks.
To
find out the area and circumference of a circle, you need to
use a special number called p(pronounced
pie). This number is about 3.141592654(from memory!) and you must multiply
it by the square of the radius to find the area of a circle. To find the circumference
of a circle you need to multiply pi(the English way of spelling it) by 2 times
the radius, which is, as we all know(hopefully), the diameter.
The angle hanging down from an arc at the centre of a circle is always double that of the angle hanging down from the arc at the circumference (or subtended by an arc if you're a superbrain!). See below:
Fig.1
...............................................
For much more on The Circle including Chords,
as well as Algebra, Areas and Volumes, Probability and much, much more, get Adam's unique, All-NEW Math, Maths Buster revision study guide e-Book! 116 pages packed full of detail, content, handy hints, questions and answers and more, and written in Adam's popular light-hearted and very easy to understand style, everything you need to help you get a top grade in your math or maths exam!
Plus, check out the NEW section on Graphs, as well as the top revision method Adam used to pass his GCSE maths exam with top grade A at just 9 years old!
It costs just £12.99 ($22 US), and you can have instant, immediate delivery and access as soon as you complete your order!
Grab the NEW Maths, Math Buster e-Book by Adam Spencer today!
CLICK HERE TO LEARN MORE AND ORDER NOW!
