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Thursday, May 14, 2015

Maths

This is my Maths follow up.

I have been learning how to do 'loci'.
This is a locus circle.
Its radius is 5cm as shown.
How to calculate the loci:

We use 'pi' (no, not the pie you eat) which is 3.14
Then we calculate it.
3.14(pi) x 5cm.
Okay, but thats only half the circle.
We need the whole circle, so we times it by 2.
2 x 3.14 x 5cm= 31.4
Thats loci.

To do the diameter not the radius you will be shown this:
Instead
3.14(pi) x 8cm.
With out the need to double it because its already the whole circle.

Thanks

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